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Goodwill, Other Intangibles, and Property and Equipment - Property and Equipment (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Property and equipment including Assets held for sale    
Cost   $ 9,147
Accumulated Amortization   4,635
Net Carrying Value   4,512
Property and equipment classified as Assets held for sale    
Cost   (226)
Accumulated Amortization   (131)
Net Carrying Value   (95)
Total property and equipment per Consolidated Balance Sheet    
Cost $ 9,780 8,921
Accumulated amortization 5,575 4,504
Net carrying value 4,205 4,417
Internal-use software    
Property and equipment including Assets held for sale    
Cost   6,578
Accumulated Amortization   3,282
Net Carrying Value   3,296
Total property and equipment per Consolidated Balance Sheet    
Cost 7,061  
Accumulated amortization 4,048  
Net carrying value 3,013  
Other property and equipment    
Property and equipment including Assets held for sale    
Cost   2,569
Accumulated Amortization   1,353
Net Carrying Value   $ 1,216
Total property and equipment per Consolidated Balance Sheet    
Cost 2,719  
Accumulated amortization 1,527  
Net carrying value $ 1,192