Annual report pursuant to Section 13 and 15(d)

Goodwill and Other Intangible Assets, Net (Other Intangible Assets) (Details)

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Goodwill and Other Intangible Assets, Net (Other Intangible Assets) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Finite-lived and Indefinite-lived Intangible Assets by Major Class [Line Items]      
Indefinite-Lived Trade Names $ 2,878 $ 2,878  
Intangible Assets, Gross (Excluding Goodwill) 6,685 6,602  
Other Intangible Assets (Excluding Goodwill), Accumulated Amortization 3,231 3,104  
Other intangible assets, net (note 6) 3,454 3,498  
Finite-Lived Intangible Assets, Period Increase (Decrease) (48) (130)  
Amortization 282 282 $ 237
Purchased and internally developed software      
Finite-lived and Indefinite-lived Intangible Assets by Major Class [Line Items]      
Capitalized Computer Software, Gross 952 885  
Capitalized Computer Software, Accumulated Amortization 663 603  
Capitalized Computer Software, Net $ 289 282  
Finite-Lived Intangible Asset, Useful Life 2 years 8 months 12 days    
Customer Relationships [Member]      
Finite-lived and Indefinite-lived Intangible Assets by Major Class [Line Items]      
Finite-Lived Customer Relationships, Gross $ 2,845 2,829  
Finite-Lived Customer Relationships, Accumulated Amortization 2,564 2,499  
Finite lived customer relationships, net $ 281 330  
Finite-Lived Intangible Asset, Useful Life 6 years    
Debt [Member]      
Finite-lived and Indefinite-lived Intangible Assets by Major Class [Line Items]      
Debt Issuance Costs, Gross $ 10 10  
Accumulated Amortization, Debt Issuance Costs 4 2  
Debt Issuance Costs, Net $ 6 8  
Finite-Lived Intangible Asset, Useful Life 3 years    
Finite-Lived Intangible Assets [Member]      
Finite-lived and Indefinite-lived Intangible Assets by Major Class [Line Items]      
Amortization $ 149 $ 149 $ 160