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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Basic    
Net income attributable to stockholders $ 2,939 $ 3,022
Less: cumulative dividends on subsidiary preferred stock(a) (952) (46)
Net income (loss) attributable to common stockholders $ 1,987 $ 2,976
Weighted-average common shares outstanding - basic (in shares) 1,458 1,447
Basic earnings per common share (in dollars per share) $ 1.36 $ 2.06
Diluted    
Net income attributable to common stockholders – diluted $ 1,987 $ 2,976
Weighted-average common shares outstanding - basic (in shares) 1,458 1,447
Dilutive effect of warrants and awards under stock incentive plans (in shares) 12 17
Weighted-average common shares outstanding - diluted (in shares) 1,470 1,464
Diluted earnings per common share (in dollars per share) $ 1.35 $ 2.03
Potentially dilutive securities (in shares) 6 2
Cruise Preferred Shares    
Basic    
Less: cumulative dividends on subsidiary preferred stock(a) $ 909