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Equity Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Equity compensation expense | $ 4 | $ 5
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures | 258,327 |
Stock appreciation rights granted, weighted average exercise price (per share) | $ 106.53 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | 1,736,018 |
Options exercisable, weighted average price (per share) | $ 105.02 |
Options, remaining term | 4 years 6 months |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 50 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition | 10 months 24 days |
Performance Shares |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures | 78,687 |
Restricted Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures | 215,601 |

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