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Equity Equity (Share Repurchase Program) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Equity, Class of Treasury Stock [Line Items] |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ 163 | $ 101 | $ 300
Share Repurchase Program [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Treasury Stock, Shares, Acquired | 1,074,413 | 546,614 |
Treasury Stock, Value, Acquired, Cost Method | $ 153 | $ 80 |
Treasury Stock Acquired, Average Cost Per Share | $ 142.05 | $ 146.00 |

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