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Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Equity [Abstract] |  |  |
Stock Repurchase Program, Authorized Amount | $ 400 |  | $ 400
Treasury Stock, Value, Acquired, Cost Method | 99 | $ 163 | 101
Proceeds from Issuance of Common Stock | $ 0 | $ 481 | $ 0
Stock Issued During Period, Shares, New Issues |  | 6,172,840 |
Shares Issued, Price Per Share |  | $ 81.00 |
Common stock par value | $ 0.01 | $ 0.01 |
Common Stock Issued Underwriter Option |  | 925,926 |
Common Stock Price Per Share Underwriter Option |  | $ 81.00 |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 72 |  |

X
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- Definition Price per share of available common stock agreed upon in the Underwriting Agreement available for purchase within 30 days of the original agreement up to the amount of shares agreed upon. + References No definition available. + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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