Share-Based Compensation (RSU Compensation Expense) (Details) - USD ($) $ in Millions |
12 Months Ended | ||||
---|---|---|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||
Pretax compensation expense | $ 21 | $ 22 | $ 20 | ||
RSUs | |||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||
Pretax compensation expense | 10 | 10 | 11 | ||
Tax benefit | (2) | (1) | (2) | ||
Compensation expense, net of tax | 8 | 9 | 9 | ||
Total value of RSUs converted | [1] | 11 | 12 | 10 | |
Total fair value of RSUs vested | $ 10 | $ 10 | $ 16 | ||
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