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Employee Incentive Plans (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended			188 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	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	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	$ 6	$ 5	$ 5
Maximum shares of stock distributable under 2007 Stock Incentive Plan	30,000,000			30,000,000
Shares granted to external directors				36,609
2007 Stock Incentive Plan Compensation Expense	$ 92	$ 80	$ 65
Estimated Future 2007 Stock Incentive Plan Compensation Expense	$ 43			$ 43
Post employment shares distribution				1,225,895
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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