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Earnings Per Share - Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Aug. 18, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Common stock outstanding (in shares) 418 434  
Authorized repurchase amount     $ 1,500
Share repurchases (in shares) 5    
Treasury stock acquired, average price per share (in usd per share) $ 34.00    
Repurchase of common stock $ 175 $ 0  
Remaining authorized repurchase amount $ 1,172    
Decrease in average shares outstanding (in shares) 15    
Incremental common shares attributable to dilutive effect of accelerated share repurchase agreements (in shares) 19 19  
Revolving Credit Agreement      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Credit agreement term 5 years