Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details)

v2.4.0.6
Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 132 Months Ended
Dec. 31, 2016
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2027
Income Tax Expense (Benefit) [Abstract]              
Current Federal Tax Expense (Benefit)       $ (156) $ (85) $ (119)  
Current State and Local Tax Expense (Benefit)       (32) 6 (49)  
Current Foreign Tax Expense (Benefit)       (120) (111) (85)  
Current Income Tax Expense (Benefit)       (308) (190) (253)  
Deferred Federal Income Tax Expense (Benefit)       (42) 27 249  
Deferred State and Local Income Tax Expense (Benefit)       (6) 21 46  
Deferred Foreign Income Tax Expense (Benefit)       4 14 3  
Deferred Income Tax Expense (Benefit)       (44) 62 298  
Income Tax Expense (Benefit)       352 128 (45)  
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]              
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate       (329) (339) 29  
Income Tax Reconciliation, Equity in Earnings (Losses) of Unconsolidated Subsidiary       0 112 0  
Income Tax Reconciliation, State and Local Income Taxes       (22) 18 (7)  
Income Tax Reconciliation, Foreign Income Tax Rate Differential       (3) 48 (4)  
Income Tax Reconciliation, Change in Deferred Tax Assets Valuation Allowance       (15) 0 0  
Income Tax Reconciliation, Tax Exempt Income       8 27 20  
Income Tax Reconciliation, Other Adjustments       9 6 7  
Components of Deferred Tax Assets and Liabilities [Abstract]              
Deferred Tax Assets, Operating Loss Carryforwards, Domestic       70 40    
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost       44 33    
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities       69 154    
Deferred Tax Assets, Deferred Income       5 9    
Deferred Tax Assets, Other       144 92    
Deferred Tax Assets, Gross       332 328    
Deferred Tax Assets, Valuation Allowance       (16) (1)    
Deferred Tax Assets, Net       316 327    
Deferred Tax Liabilities, Investment in Noncontrolled Affiliates       190 115    
Deferred Tax Liabilities, Goodwill and Intangible Assets, Intangible Assets       1,661 1,718    
Deferred Tax Liabilities, Discount on exchangeable debentures       978 947    
Deferred Tax Liaiblities, Deferred Gain on Debt Retirements       321 313    
Deferred Tax Liabilities, Other       63 95    
Deferred Tax Liabilities       3,213 3,188    
Deferred Tax Assets (Liabilities), Net       2,897 2,861    
Deferred Tax Liabilities, Current       (851) (152)    
Deferred income taxes       (2,046) (2,709)    
Income Tax Uncertainties [Abstract]              
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions     6 13 11    
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions       3 3    
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions       (5) (23)    
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations       (11) (28)    
Unrecognized Tax Benefits       123 123 160  
Unrecognized Tax Benefits that Would Impact Effective Tax Rate       71      
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued       23      
Valuation Allowance, Deferred Tax Asset, Change in Amount       (15)      
Deferred Tax Assets, Capital Loss Carryforwards       $ 67      
Tax Credit Carryforward, Expiration Dates 27 16         24