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Employee Incentive Plans (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended 200 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2023
Feb. 28, 2023
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 $ 7 $ 6 $ 5    
Maximum shares of stock distributable under 2007 Stock Incentive Plan 40,000,000     40,000,000 30,000,000
Shares granted to external directors       39,025  
2007 Stock Incentive Plan Compensation Expense $ 100 $ 92 $ 80    
Estimated Future 2007 Stock Incentive Plan Compensation Expense $ 42     $ 42  
Post employment shares distribution       1,320,900  
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%