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Employee Benefit Plans - Rollforward of the Benefit Obligation and Fair Value of Plan Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Amounts recognized in the balance sheet      
Liabilities $ (3) $ (17)  
Pension Plans      
Rollforward of projected benefit obligation      
Benefit obligation at beginning of year 4,081 4,334  
Service cost 19 19 $ 17
Interest cost 111 104 121
Actuarial loss (gain) (1,064) (122)  
Plan amendments 0 (1)  
Plan settlements (2) (16)  
Benefits paid (196) (217)  
Other (42) (20)  
Projected benefit obligation at end of year 2,907 4,081 4,334
Rollforward of fair value of plan assets      
Balance at beginning of period 3,605 3,985  
Actual return on plan assets (982) (186)  
Employer contributions 37 38  
Benefits paid (196) (217)  
Plan settlements (2) (15)  
Other (46) 0  
Balance at end of period 2,416 3,605 $ 3,985
Funded (unfunded) status (491) (476)  
Amounts recognized in the balance sheet      
Assets 75 117  
Liabilities (566) (593)  
Net amount recognized $ (491) $ (476)