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Employee Incentive Plans (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended | 212 Months Ended
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 50.00% |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 10.00% |  |  |
Defined Contribution Plan Vesting Period | 6 years |  |  |
401(k) plan contribution expense | $ 8 | $ 7 | $ 6 |
Maximum shares of stock distributable under 2007 Stock Incentive Plan | 40,000,000 |  |  | 40,000,000
Shares granted to external directors |  |  |  | 40,586
2007 Stock Incentive Plan Compensation Expense | $ 112 | $ 100 | $ 92 |
Estimated Future 2007 Stock Incentive Plan Compensation Expense | $ 39 |  |  | $ 39
Post employment shares distribution |  |  |  | 1,392,895
2007 Stock Incentive Plan (Shares) | Vesting And Distribution Of Grants Prior To December 31, 2021 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting rights, description | 10% on the first vesting date, which is on or about May 9 of each year; and (b) an additional 15% on each of the following six anniversaries of the first vesting. |  |  |
2007 Stock Incentive Plan (Shares) | Employees [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting rights, description | In 2021, the Company’s Compensation Committee approved a change to the vesting schedule for the Stock Incentive Plan. For awards granted on December 31, 2021 onwards, restricted stock units vest and become distributable to participants 20% on each vesting date |  |  |
2007 Stock Incentive Plan (Shares) | External Director [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting rights, description | annual awards granted to all directors on December 31 of each year are fully vested and distributed immediately on grant date. |  |  |
Vesting period | 5 years |  |  |
2007 Stock Incentive Plan (Shares) | External Director [Member] | Share-based Payment Arrangement, Tranche One [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting percentage per year | 20.00% |  |  |

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