Share-Based Payments (Narrative) (Details) - USD ($) |
12 Months Ended | |||
|---|---|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Apr. 23, 2015 |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Vesting period of incentive awards (in years) | 3 years | |||
| Contractual lives of options granted under long-term incentive compensation plans | 10 years | |||
| Number of Common Share Equivalents Authorized Under Long-term Incentive Plans | 60,000,000 | |||
| Number of Remaining Common Share Equivalents Available for Grant Under Long-term Incentive Plans | 30,000,000 | |||
| Pre Tax Amount Of Non Vested Stock Options And Restricted Stock Awards And Units Not Yet Recognized | $ 62,000,000 | |||
| Total fair value of shares vested during the period | $ 75,000,000 | $ 35,000,000 | $ 89,000,000 | |
| Non-vested awards, compensation cost not yet recognized, weighted-average period for recognition | 1 year 4 months 2 days | |||