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Equity - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jan. 01, 2019
Class of Stock [Line Items] |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  | $ 2,000,000,000.0
Repurchases of common stock | $ 340,000,000 | $ 300,000,000 | $ 1,120,000,000 | $ 1,059,000,000 |
Stock repurchase program, remaining authorized amount | $ 880,000,000 |  | $ 880,000,000 |  |
Cash dividends per share (in dollars per share) | $ 0.275 | $ 0.24 | $ 0.825 | $ 0.72 |
Aggregate payout | $ 155,000,000 | $ 138,000,000 | $ 467,000,000 | $ 417,000,000 |
Rule 10b5-1 Trading Plan |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Repurchases of common stock (in shares) |  |  | 12.5 |  |
Repurchases of common stock |  |  | $ 1,000,000,000.0 |  |
Open Market |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Repurchases of common stock (in shares) |  |  | 1.3 |  |
Repurchases of common stock |  |  | $ 100,000,000 |  |

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