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Equity (Stock-Based Compensation) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Stock-based compensation |  |  |
Stock based compensation costs | $ 100 | $ 82 | $ 76
Tax benefits related to stock-based compensation arrangements | 17 | $ 21 | $ 29
Unrecognized stock based compensation costs | $ 112 |  |
Unrecognized stock based compensation costs weighted-average period of recognition (in years) | 1 year 9 months 18 days |  |
Common stock authorized for awards (in shares) | 15,000,000 |  |
Share-based Payment Arrangement [Member] |  |  |
Stock-based compensation |  |  |
Number of additional shares available for grant (in shares) | 0 |  |

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