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Employee Benefits - Reconciliation of Beginning and Ending Balance of Pension Plan Assets Measured at Fair Value (Detail) - Pension - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Beginning of year $ 13,739 $ 20,087
End of year 13,536 13,739
Level 3    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Beginning of year 1,623 1,651
Actual gain (loss) on plan assets (36) 68
Purchases (sales) (20) 9
Transfers out (33) (105)
End of year 1,534 1,623
Level 3 | Equity securities    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Beginning of year 0  
End of year 0 0
Level 3 | Corporate bonds    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Beginning of year 0  
End of year 0 0
Level 3 | International bonds    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Beginning of year 0  
End of year 0 0
Level 3 | Real estate    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Beginning of year 1,002 972
Actual gain (loss) on plan assets (54) 19
Purchases (sales) 48 14
Transfers out 0 (3)
End of year 996 1,002
Level 3 | Private equity    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Beginning of year 569 569
Actual gain (loss) on plan assets 14 30
Purchases (sales) (67) (11)
Transfers out (4) (19)
End of year 512 569
Level 3 | Hedge funds    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Beginning of year 52 110
Actual gain (loss) on plan assets 4 19
Purchases (sales) (1) 6
Transfers out (29) (83)
End of year $ 26 $ 52