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Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Numerator:    
Net income $ 1,097 $ 84
Denominator:    
Weighted average shares of common stock - basic (in shares) 1,173 1,173
Dilutive effect of equity incentive awards (in shares) 17 12
Weighted average shares of common stock - diluted (in shares) 1,190 1,185
Net income per share:    
Basic (in usd per share) $ 0.94 $ 0.07
Diluted (in usd per share) $ 0.92 $ 0.07
Common stock equivalents excluded from income per diluted share because their effect would have been anti-dilutive (in shares) 2 2