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Equity - Equity Repurchase Program (Details) - USD ($) shares in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Equity, Class of Treasury Stock [Line Items] |  |
Treasury Stock, Value, Acquired, Cost Method | $ 150 | $ 200
Treasury Stock, Shares, Acquired | 2,700 | 3,400
2/4/2019-12/31/2020 [Member] |  |
Equity, Class of Treasury Stock [Line Items] |  |
Stock Repurchase Program, Authorized Amount | $ 1,000 |
1/1/2020-12/31/2022 [Member] |  |
Equity, Class of Treasury Stock [Line Items] |  |
Stock Repurchase Program, Authorized Amount | $ 1,500 |

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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