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Equity (Details) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Class of Stock [Line Items]          
Accounting Standards Update [Extensible List]     us-gaap:AccountingStandardsUpdate201613Member   us-gaap:AccountingStandardsUpdate201613Member
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance at beginning of period $ 33,287 $ 2,394 $ 34,595 $ 2,293 $ 2,293
Net income (loss) 0 223 368 448  
Measurement period adjustments related to First Data acquisition (see Note 4) (4)   (126)    
Distributions paid to noncontrolling interests (16)   (30)    
Other comprehensive income (loss) 190 (108) (453) (126)  
Share-based compensation 94 15 202 34  
Shares issued under stock plans 27 22 (48) 17  
Purchases of treasury stock (550) 0 (1,435) (120)  
Balance at end of period 33,028 $ 2,546 33,028 $ 2,546 $ 34,595
Net income attributable to redeemable noncontrolling interest 9   18    
Distributions paid to redeemable noncontrolling interests $ 10   $ 22    
Common Shares          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance at beginning of period (in shares) 791 791 791 791 791
Balance at beginning of period $ 8 $ 8 $ 8 $ 8 $ 8
Balance at end of period (in shares) 791 791 791 791 791
Balance at end of period $ 8 $ 8 $ 8 $ 8 $ 8
Treasury Stock          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance at beginning of period (in shares) 117 399 112 399 399
Balance at beginning of period $ (3,922) $ (10,423) $ (3,118) $ (10,340) $ (10,340)
Shares issued under stock plans (in shares) (1) 0 (4) (2)  
Shares issued under stock plans $ 43 $ 15 $ 124 $ 52  
Purchases of treasury stock (in shares) 6 0 14 2  
Purchases of treasury stock $ (550) $ 0 $ (1,435) $ (120)  
Balance at end of period (in shares) 122 399 122 399 112
Balance at end of period $ (4,429) $ (10,408) $ (4,429) $ (10,408) $ (3,118)
Additional Paid-In Capital          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance at beginning of period 23,693 1,034 23,741 1,057 1,057
Share-based compensation 94 15 202 34  
Shares issued under stock plans (16) 7 (172) (35)  
Balance at end of period 23,771 1,056 23,771 1,056 23,741
Accumulated Other Comprehensive Loss          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance at beginning of period (811) (85) (180) (67) (67)
Other comprehensive income (loss) 167 (108) (464) (126)  
Balance at end of period (644) (193) (644) (193) (180)
Retained Earnings          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance at beginning of period 12,875 11,860 12,528 11,635 11,635
Net income (loss) 2 223 394 448  
Balance at end of period 12,877 $ 12,083 12,877 $ 12,083 12,528
Noncontrolling Interests          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance at beginning of period 1,444   1,616    
Net income (loss) (2)   (26)    
Measurement period adjustments related to First Data acquisition (see Note 4) (4)   (126)    
Distributions paid to noncontrolling interests (16)   (30)    
Other comprehensive income (loss) 23   11    
Balance at end of period $ 1,445   1,445   1,616
Cumulative Effect, Period of Adoption, Adjustment          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance at beginning of period     (45)    
Balance at end of period         (45)
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance at beginning of period     $ (45)    
Balance at end of period         $ (45)