Share-Based Payments (Summary Of Compensation Costs Recognized In The Consolidated Statements of Operations) (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|
| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | |||
| Tax benefits related to compensation cost | $ (14) | $ (13) | $ (13) |
| Allocated Share-based Compensation Expense, Net of Tax | 43 | 40 | 38 |
| Restricted Stock Awards [Member] | |||
| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | |||
| Allocated Share-Based Compensation Expense | $ 57 | $ 53 | $ 51 |