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Goodwill, Customer Relationships and Other Intangible Assets (Details)
$ in Millions
12 Months Ended
Oct. 31, 2017
reporting_unit
Dec. 31, 2019
USD ($)
reporting_unit
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Finite-Lived Intangible Assets [Line Items]        
Goodwill   $ 9,360 $ 9,360  
Finite-lived intangible assets, net   468 893  
Gross carrying amounts of goodwill, customer relationships and other intangible assets   17,200    
Amortization expense for intangible assets   533 581 $ 671
Estimated amortization expense for intangible assets        
2020   475    
2021   182    
2022   87    
2023   9    
2024   $ 9    
Number of reporting units | reporting_unit 1 1    
Customer relationships        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible assets, net   $ 468 893  
Accumulated amortization   5,231 4,806  
Capitalized software        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible assets, net   311 311  
Accumulated amortization   $ 1,780 $ 1,712