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Employee Incentive Plans (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 167 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021
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 | $ 1 | $ 1 |
Maximum shares of stock distributable under 2007 Stock Incentive Plan | 30,000,000 |  | 30,000,000
Shares granted to external directors |  |  | 29,709
2007 Stock Incentive Plan Compensation Expense | $ 17 | $ 16 |
Estimated Future 2007 Stock Incentive Plan Compensation Expense | $ 37 |  | $ 37
Post employment shares distribution |  |  | 1,067,719
2007 Stock Incentive Plan (Shares) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting Percentage, description | •10% on the first vesting date, which is on or about May 9 of each year; and•an additional 15% on each of the following six anniversaries of the first vesting, assuming continued employment with the Company and compliance with non-competition and other applicable covenants. |  |
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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