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Earnings Per Share - Share Repurchases (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Earnings Per Share [Abstract] |  |  |  |
Shares repurchased (in shares) | 16 | 15 | 39 | 46
Cost of shares | $ 1,111 | $ 1,006 | $ 2,767 | $ 2,816

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