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Earnings Per Share - Share Repurchase Activity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
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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

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