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Employee Incentive Plans (Narrative) (Details) - USD ($)
$ in Millions
 9 Months Ended 209 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Apr. 19, 2023
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 $ 6 $ 6    
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 $ 80 $ 75    
Estimated Future 2007 Stock Incentive Plan Compensation Expense $ 24   $ 24  
Post employment shares distribution     1,392,895  
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%