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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Pension Plan [Member]      
Defined Benefit Plan, Net Periodic Cost (Benefit)      
Service cost $ (4) $ (4) $ (4)
Interest cost 111 96 127
Expected return on plan assets (202) (205) (215)
Amortization of prior service credit 0 0 0
Amortization of actuarial loss 62 69 60
Net periodic cost (benefit) (25) (36) (24)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss)      
Amortization of actuarial loss 62 69 60
Amortization of prior service credit 0 0 0
Prior service cost (credit) 89 214 (106)
Prior service cost 0 0 0
Total 151 283 (46)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]      
Net loss (1,664) (1,815) (2,098)
Prior service credit 0 0 0
Total (1,664) (1,815) (2,098)
Other Postretirement Benefits Plan [Member]      
Defined Benefit Plan, Net Periodic Cost (Benefit)      
Service cost 0 0 0
Interest cost 4 3 6
Expected return on plan assets (2) (3) (4)
Amortization of prior service credit (7) (7) (7)
Amortization of actuarial loss 7 8 7
Net periodic cost (benefit) 2 1 2
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss)      
Amortization of actuarial loss 7 8 7
Amortization of prior service credit (7) (7) (7)
Prior service cost (credit) 30 5 (11)
Prior service cost 0 0 0
Total 30 6 (11)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]      
Net loss (87) (124) (136)
Prior service credit 47 54 60
Total $ (40) $ (70) $ (76)