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Employee Incentive Plans (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 191 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2023 | Feb. 28, 2023 | Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 10.00% |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 50.00% |  |  |  |
Defined Contribution Plan Vesting Period | 6 years |  |  |  |
401(k) plan contribution expense | $ 2 | $ 2 |  |  |
Maximum shares of stock distributable under 2007 Stock Incentive Plan | 40,000,000 |  | 40,000,000 | 40,000,000 | 30,000,000
Shares granted to external directors |  |  | 36,609 |  |
2007 Stock Incentive Plan Compensation Expense | $ 26 | $ 21 |  |  |
Estimated Future 2007 Stock Incentive Plan Compensation Expense | $ 37 |  | $ 37 |  |
Post employment shares distribution |  |  | 1,225,895 |  |
Awards Granted On December 31, 2021 Onwards [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting rights, description | The vesting and distribution of grants prior to December 31, 2021 remain in accordance with the following schedule: (a) 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. |  |  |  |
Grants Prior To December 31, 2021 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting rights, description | For awards granted on December 31, 2021 onwards, restricted stock units vest and become distributable to participants 20% on each vesting date, which is on or about May 9 of each year |  |  |  |
External Director [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting rights, description | 20% |  |  |  |
All Directors [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting rights, description | (b) annual awards granted to all directors on December 31 of each year are fully vested and distributed immediately on grant date. |  |  |  |
2007 Stock Incentive Plan (Shares) | External Director [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period | 5 years |  |  |  |
2007 Stock Incentive Plan (Shares) | External Director [Member] | Commencing One Year After Grant Date [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage per year | 20.00% |  |  |  |

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