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Share-based Compensation and Employee Benefits - Benefit Obligation, Plan Assets and Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Pension Benefits      
Change in benefit obligation:      
Benefit obligation at beginning of period $ 2,077 $ 2,658  
Service cost 55 55 $ 53
Interest cost 107 57 45
Actuarial loss (gain) 14 (503)  
Benefits paid (132) (190)  
Participant contributions 0 0  
Settlements (219) 0  
Other 0 0  
Benefit obligation at end of period 1,902 2,077 2,658
Change in plan assets:      
Fair value of plan assets at beginning of period 1,741 2,231  
Actual return on plan assets 122 (350)  
Employer contributions 50 50  
Participant contributions 0 0  
Benefits paid (132) (190)  
Settlements (219) 0  
Other 0 0  
Fair value of plan assets at end of period 1,562 1,741 2,231
Funded status - net (liability) asset at December 31, (340) (336)  
Amounts recognized in the consolidated balance sheets:      
Non-current benefit asset(a) 0 0  
Current benefit liability 0 0  
Non-current benefit liability (340) (336)  
Funded status - net (liability) asset at December 31, (340) (336)  
Amounts of pre-tax accumulated other comprehensive (loss) income recognized in the consolidated balance sheets:      
Unrecognized net actuarial (loss) gain (384) (455)  
Unrecognized prior service (cost) credit 0 (1)  
Accumulated other comprehensive (loss) income (384) (456)  
Information related to plans whose accumulated benefit obligations exceeded the fair value of plan assets:      
Accumulated benefit obligation 1,870 2,047  
Fair value of plan assets 1,562 1,741  
OPEB      
Change in benefit obligation:      
Benefit obligation at beginning of period 195 257  
Service cost 1 1 1
Interest cost 10 5 4
Actuarial loss (gain) (6) (44)  
Benefits paid (25) (26)  
Participant contributions 1 1  
Settlements 0 0  
Other 1 1  
Benefit obligation at end of period 177 195 257
Change in plan assets:      
Fair value of plan assets at beginning of period 302 382  
Actual return on plan assets 44 (63)  
Employer contributions 0 7  
Participant contributions 1 1  
Benefits paid (25) (26)  
Settlements 0 0  
Other 1 1  
Fair value of plan assets at end of period 323 302 $ 382
Funded status - net (liability) asset at December 31, 146 107  
Amounts recognized in the consolidated balance sheets:      
Non-current benefit asset(a) 263 239  
Current benefit liability (14) (15)  
Non-current benefit liability (103) (117)  
Funded status - net (liability) asset at December 31, 146 107  
Amounts of pre-tax accumulated other comprehensive (loss) income recognized in the consolidated balance sheets:      
Unrecognized net actuarial (loss) gain 149 135  
Unrecognized prior service (cost) credit 3 4  
Accumulated other comprehensive (loss) income 152 139  
Information related to plans whose accumulated benefit obligations exceeded the fair value of plan assets:      
Accumulated benefit obligation 119 167  
Fair value of plan assets 2 34  
OPEB | Other Affiliates      
Amounts recognized in the consolidated balance sheets:      
Non-current benefit asset(a) $ 53 $ 45