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Equity (Details) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance at beginning of period $ 31,672 $ 33,070
Net income (loss) 672 308
Other comprehensive income (loss) 88 (158)
Share-based compensation 61 66
Shares issued under stock plans (15) (88)
Purchases of treasury stock (500) (612)
Balance at end of period 31,978 32,586
Net income attributable to redeemable noncontrolling interest $ 10 $ 10
Common Shares    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance at beginning of period (in shares) 784 789
Balance at beginning of period $ 8 $ 8
Balance at end of period (in shares) 784 789
Balance at end of period $ 8 $ 8
Treasury Stock    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance at beginning of period (in shares) 134 121
Balance at beginning of period $ (6,140) $ (4,375)
Shares issued under stock plans (in shares) (2) (3)
Shares issued under stock plans $ 79 $ 99
Purchases of treasury stock (in shares) 5 5
Purchases of treasury stock $ (500) $ (612)
Balance at end of period (in shares) 137 123
Balance at end of period $ (6,561) $ (4,888)
Additional Paid-In Capital    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance at beginning of period 22,983 23,643
Share-based compensation 61 66
Shares issued under stock plans (94) (187)
Balance at end of period 22,950 23,522
Accumulated Other Comprehensive Loss    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance at beginning of period (745) (387)
Other comprehensive income (loss) 105 (149)
Balance at end of period (640) (536)
Retained Earnings    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance at beginning of period 14,846 13,441
Net income (loss) 669 304
Balance at end of period 15,515 13,745
Noncontrolling Interests    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance at beginning of period 720 740
Net income (loss) 3 4
Other comprehensive income (loss) (17) (9)
Balance at end of period $ 706 $ 735