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Earnings Per Share - Narrative (Details) - USD ($) shares in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jul. 15, 2019
Earnings Loss Per Share [Line Items] |  |  |  |  |
Repurchases of common stock | $ 363,000,000 | $ 34,000,000 | $ 1,426,000,000 | $ 1,010,000,000 |
Amount remaining under repurchase programs | $ 3,300,000,000 |  | $ 3,300,000,000 |  |
Open Market Repurchase Program |  |  |  |  |
Earnings Loss Per Share [Line Items] |  |  |  |  |
Number of shares repurchased (in shares) | 4.1 |  | 16.8 |  |
Repurchases of common stock | $ 400,000,000 |  | $ 1,400,000,000 |  |
July 2019 Share Repurchase Program |  |  |  |  |
Earnings Loss Per Share [Line Items] |  |  |  |  |
Authorized amount under share repurchase program |  |  |  |  | $ 3,000,000,000.0

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