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Equity - Narrative (Details) - USD ($) |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
May 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Feb. 13, 2019 | Aug. 01, 2018 | Nov. 30, 2017
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |
Purchase of common stock value under the share repurchase program |  | $ 1,072,000,000 | $ 750,000,000 |  |  |
Common Stock [Member] | 2017 Share Repurchase Program [Member] |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |
Stock repurchase program, authorized amount | $ 500,000,000 |  |  |  |  |
Stock repurchase program effective date |  | Nov. 30, 2017 |  |  |  |
Average share price | $ 49.58 |  |  |  |  |
Purchase of common stock under the share repurchase program | 10,085,647 |  |  |  |  |
Common Stock [Member] | 2017 Share Repurchase Program [Member] | Maximum [Member] |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  | $ 500,000,000
Common Stock [Member] | 2018 Share Repurchase Program [Member] |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  | $ 1,000,000,000 |  |
Stock repurchase program effective date |  | Aug. 01, 2018 |  |  |  |
Average share price |  | $ 36.24 | $ 39.31 |  |  |
Purchase of common stock under the share repurchase program |  | 8,895,142 | 6,350,857 |  |  |
Stock repurchase program expiration date |  | Dec. 31, 2020 |  |  |  |
Purchase of common stock value under the share repurchase program |  | $ 322,000,000 | $ 250,000,000 |  |  |
Remaining available amount of common stock under the share repurchase program |  | $ 428,000,000 |  |  |  |
Common Stock [Member] | 2018 Share Repurchase Program [Member] | Maximum [Member] |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  | $ 750,000,000 |

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