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Income Per Share - Reconciliation of Basic and Diluted EPS (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Basic income per share:        
Net income $ 1,618 $ 249 $ 2,614 $ 683
Weighted average number of common shares outstanding — basic (in shares) 245 244 245 246
Income per weighted average common share — basic (in usd per share) $ 6.60 $ 1.02 $ 10.67 $ 2.78
Diluted income per share:        
Net income $ 1,618 $ 249 $ 2,614 $ 683
Weighted average number of common shares outstanding — basic (in shares) 245 244 245 246
Incremental shares attributable to the issuance of equity compensation (treasury stock method) (in shares) 0 1 0 1
Weighted average number of common shares outstanding- dilutive (in shares) 245 245 245 247
Income per weighted average common share — diluted (in usd per share) $ 6.60 $ 1.02 $ 10.67 $ 2.77