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Income Per Share - Basic and Diluted EPS (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Basic and diluted income per share:        
Net Income, basic $ 513 $ 1,078 $ 2,249 $ 996
Net income, diluted $ 513 $ 1,078 $ 2,249 $ 996
Weighted average number of common shares outstanding — basic (in shares) 237,000 245,000 240,000 245,000
Weighted average number of common shares outstanding — diluted (in shares) 237,000 245,000 240,000 245,000
Income per weighted average common share — basic (in usd per share) $ 2.16 $ 4.40 $ 9.37 $ 4.07
Income per weighted average common share — diluted (in usd per share) $ 2.16 $ 4.40 $ 9.37 $ 4.07