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Share-based Compensation and Employee Benefits - Pensions and Other Postretirement Benefit Plans - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Savings plan - defined contribution plan      
Pension and Other Postretirement Benefit Plans      
Percentage of eligible compensation contributed 5.00%    
Plan vesting period 2 years    
Plan cost $ 53 $ 51 $ 48
Pension Benefits      
Pension and Other Postretirement Benefit Plans      
Percentage of employees covered 100.00%    
Vesting period 3 years    
Settlements $ 179    
OPEB      
Pension and Other Postretirement Benefit Plans      
Medicare participation, age 65    
Actuarial Assumptions and Sensitivity Analysis      
Weighted-average annual rate of increase in the per capita cost of covered health care benefits 5.60%    
Ultimate health care cost trend rate 4.00%