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Earnings Per Share - Share Repurchases (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Earnings Per Share [Abstract] |  |  |  |
Shares repurchased (in shares) | 11 | 16 | 23 | 31
Cost of shares | $ 860 | $ 974 | $ 1,656 | $ 1,810

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