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Employee Benefit Plans - Net Periodic Benefits Cost and Other Recognized in the OCI (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pension Plan [Member]      
Defined Benefit Plan, Net Periodic Cost (Benefit)      
Service cost $ (2) $ (3) $ (4)
Interest cost 176 180 111
Expected return on plan assets (230) (235) (202)
Amortization of prior service credit 0 0 0
Amortization of actuarial loss 34 29 62
Net periodic cost (benefit) (18) (23) (25)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss)      
Amortization of actuarial loss 34 29 62
Amortization of prior service credit 0 0 0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax (41) (142) 89
Prior service cost 0 0 0
Total (7) (113) 151
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]      
Net loss (1,784) (1,777) (1,664)
Prior service credit 0 0 0
Total (1,784) (1,777) (1,664)
Other Postretirement Benefits Plan [Member]      
Defined Benefit Plan, Net Periodic Cost (Benefit)      
Service cost 0 0 0
Interest cost 7 7 4
Expected return on plan assets (1) (1) (2)
Amortization of prior service credit (7) (7) (7)
Amortization of actuarial loss 5 5 7
Net periodic cost (benefit) 4 4 2
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss)      
Amortization of actuarial loss 5 5 7
Amortization of prior service credit (7) (7) (7)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax 7 (6) 30
Prior service cost 0 0 0
Total 5 (8) 30
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]      
Net loss (76) (88) (87)
Prior service credit 33 40 47
Total $ (43) $ (48) $ (40)