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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Earnings available to common stockholders $ 1,323 $ 1,075 $ 1,199 $ 881
Basic weighted-average shares outstanding (in shares) 328.8 328.0 328.6 327.7
Dilutive effect of stock warrants (in shares) 2.7 2.3 2.2 2.3
Dilutive effect of employee stock awards (in shares) 2.4 1.2 2.3 1.5
Diluted weighted-average share outstanding (in shares) 333.9 331.5 333.1 331.5
Earnings per share, basic (in dollars per share) $ 4.02 $ 3.28 $ 3.65 $ 2.69
Earnings per share, diluted (in dollars per share) $ 3.96 $ 3.24 $ 3.60 $ 2.66
CARES Act Loan Warrants        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Warrants to purchase securities (in shares) 10.0   10.0  
CARES Act Loan Warrants | Minimum        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Warrant exercise price (in dollars per share) $ 31.50   $ 31.50  
CARES Act Loan Warrants | Maximum        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Warrant exercise price (in dollars per share) $ 53.92   $ 53.92  
Stock warrants        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Potentially dilutive securities (in shares) 1.5 1.5 1.5 1.5
Employee stock awards        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Potentially dilutive securities (in shares) 0.6 0.7 0.6 0.7