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Earnings Per Share - Share Repurchase Activity (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share [Abstract]      
Stock repurchased (in shares) 13 48 72
Cost of Shares $ 867 $ 3,373 $ 4,671
Average Price Paid per Share (in dollars per share) $ 68.70 $ 70.54 $ 64.64