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Equity (Summary of Activity Related to Stock Options) (Details) - Stock Options - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Shares Under Option |  |  |
Shares Under Option Outstanding at January 1, | 4,268,091 |  |
Granted Shares Under Option | 402,976 |  |
Exercised Shares Under Option | (1,259,933) |  |
Expired Shares Under Option | (6,424) |  |
Forfeited Shares Under Option | (18,669) |  |
Shares Under Option Outstanding at December 31, | 3,386,041 | 4,268,091 |
Vested and expected to vest at December 31, | 3,376,464 |  |
Shares Under Option Exercisable at December 31, | 2,533,864 |  |
Weighted Average Exercise Price |  |  |
Weighted Average Exercise Price Outstanding at January 1, | $ 44.02 |  |
Granted Weighted Average Exercise Price | 68.96 | $ 57.43 | $ 47.58
Exercised Weighted Average Exercise Price | 37.79 |  |
Expired Weighted Average Exercise Price | 33.35 |  |
Forfeited Weighted Average Exercise Price | 60.07 |  |
Weighted Average Exercise Price Outstanding at December 31, | 49.24 | $ 44.02 |
Weighted Average Exercise Price Aggregate number of stock options expected to vest at December 31, | 49.20 |  |
Weighted Average Exercise Price Exercisable at December 31, | $ 45.25 |  |
Weighted Average Remaining Contractual Term |  |  |
Weighted Average Remaining Contractual Term Outstanding at January 1, | 5 years 6 months 29 days | 5 years 10 days |
Weighted Average Remaining Contractual Term Aggregate number of stock options expected to vest at December 31, | 5 years 6 months 25 days |  |
Weighted Average Remaining Contractual Term Exercisable at December 31, | 4 years 7 months 9 days |  |
Aggregate Intrinsic Value |  |  |
Aggregate Intrinsic Value Outstanding at January 1, | $ 79 |  |
Aggregate Intrinsic Value Outstanding at December 31, | 78 | $ 79 |
Aggregate Intrinsic Value Aggregate number of stock options expected to vest at December 31, | 78 |  |
Aggregate Intrinsic Value Exercisable at December 31, | $ 69 |  |
Sale of Stock, Price Per Share | $ 72.37 | $ 62.49 |

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