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Employee Incentive Plans (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended 176 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2021
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 $ 5 $ 5 $ 4  
Maximum shares of stock distributable under 2007 Stock Incentive Plan 30,000,000     30,000,000
Shares granted to external directors       32,544
2007 Stock Incentive Plan Compensation Expense $ 80 $ 65 $ 60  
Estimated Future 2007 Stock Incentive Plan Compensation Expense $ 42     $ 42
Post employment shares distribution       1,153,839
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 Percentage, 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 Percentage, 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 Percentage, description annual awards granted to all directors on December 31 of each year are fully vested and distributed immediately on grant date.      
Vesting percentage per year 20.00%      
Vesting period 5 years