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Equity (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance at beginning of period (in shares)     154,000,000  
Balance at beginning of period $ 30,794 $ 31,978 $ 31,527 $ 31,672
Net income (loss) 689 604 1,258 1,276
Distributions paid to noncontrolling interests (1) (1) (1) (1)
Other comprehensive income 157 (389) 304 (301)
Share-based compensation 106 94 199 155
Shares issued under stock plans (19) 10 (78) (5)
Purchases of treasury stock $ (1,010) (500) $ (2,493) (1,000)
Capital contribution from noncontrolling interest   13   13
Balance at end of period (in shares) 173,000,000   173,000,000  
Balance at end of period $ 30,716 31,809 $ 30,716 31,809
Net income attributable to redeemable noncontrolling interest 6 5 13 15
Distributions paid to redeemable noncontrolling interests $ 5 $ 8 $ 13 $ 21
Common Shares        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance at beginning of period (in shares) 784,000,000 784,000,000 784,000,000 784,000,000
Balance at beginning of period $ 8 $ 8 $ 8 $ 8
Balance at end of period (in shares) 784,000,000 784,000,000 784,000,000 784,000,000
Balance at end of period $ 8 $ 8 $ 8 $ 8
Treasury Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance at beginning of period (in shares) 165,000,000 137,000,000 154,000,000 134,000,000
Balance at beginning of period $ (9,762) $ (6,561) $ (8,378) $ (6,140)
Shares issued under stock plans (in shares) (1,000,000) (1,000,000) (3,000,000) (3,000,000)
Shares issued under stock plans $ 45 $ 44 $ 144 $ 123
Purchases of treasury stock (in shares) 9,000,000 5,000,000 22,000,000 10,000,000
Purchases of treasury stock $ (1,010) $ (500) $ (2,493) $ (1,000)
Balance at end of period (in shares) 173,000,000 141,000,000 173,000,000 141,000,000
Balance at end of period $ (10,727) $ (7,017) $ (10,727) $ (7,017)
Additional Paid-In Capital        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance at beginning of period 22,946 22,950 23,011 22,983
Share-based compensation 106 94 199 155
Shares issued under stock plans (64) (34) (222) (128)
Balance at end of period 22,988 23,010 22,988 23,010
Accumulated Other Comprehensive Loss        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance at beginning of period (1,054) (640) (1,189) (745)
Other comprehensive income 154 (365) 289 (260)
Balance at end of period (900) (1,005) (900) (1,005)
Retained Earnings        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance at beginning of period 17,939 15,515 17,376 14,846
Net income (loss) 683 598 1,246 1,267
Balance at end of period 18,622 16,113 18,622 16,113
Noncontrolling Interests        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance at beginning of period 717 706 699 720
Net income (loss) 6 6 12 9
Distributions paid to noncontrolling interests (1) (1) (1) (1)
Other comprehensive income 3 (24) 15 (41)
Capital contribution from noncontrolling interest   13   13
Balance at end of period $ 725 $ 700 $ 725 $ 700