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Earnings Per Share - Share Repurchases (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Earnings Per Share [Abstract] |  |  |  |  |
Shares repurchased (in shares) | 1 | 16 | 10 | 39 |
Cost of shares | $ 48 | $ 1,111 | $ 664 | $ 2,767 | [1]
[1] | Certain prior year data has been reclassified to conform to the current presentation.

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