Quarterly report pursuant to Section 13 or 15(d)

Other Comprehensive Income (Component of Other Comprehensive Income) (Details)

v3.8.0.1
Other Comprehensive Income (Component of Other Comprehensive Income) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Foreign currency translation adjustments before tax $ 71 $ 47
Tax expense from foreign currency translation gain (loss) (1) (20)
Foreign currency translation adjustments, net of tax $ 70 $ 27