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Employee Benefits - Fair Values for Pension Plans by Asset Category (Detail) - Pension - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount $ 13,536 $ 13,739 $ 20,087
Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 9,104 8,001  
Fair Value, Inputs, Level 1, 2 and 3 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 1,956 817  
Fair Value, Inputs, Level 1, 2 and 3 | Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 69 332  
Fair Value, Inputs, Level 1, 2 and 3 | U.S. Treasuries and agencies      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 1,412 1,541  
Fair Value, Inputs, Level 1, 2 and 3 | Corporate bonds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 2,994 2,413  
Fair Value, Inputs, Level 1, 2 and 3 | International bonds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 341 528  
Fair Value, Inputs, Level 1, 2 and 3 | Other      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 768 711  
Fair Value, Inputs, Level 1, 2 and 3 | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 996 1,002  
Fair Value, Inputs, Level 1, 2 and 3 | Private equity      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 512 569  
Fair Value, Inputs, Level 1, 2 and 3 | Hedge funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 56 88  
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 3,541 2,436  
Level 1 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 1,771 779  
Level 1 | Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 55 318  
Level 1 | U.S. Treasuries and agencies      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 1,274 1,312  
Level 1 | Corporate bonds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 204 13  
Level 1 | International bonds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 3 10  
Level 1 | Other      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 234 4  
Level 1 | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 0 0  
Level 1 | Private equity      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 0 0  
Level 1 | Hedge funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 0 0  
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 4,029 3,942  
Level 2 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 185 38  
Level 2 | Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 14 14  
Level 2 | U.S. Treasuries and agencies      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 138 229  
Level 2 | Corporate bonds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 2,790 2,400  
Level 2 | International bonds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 338 518  
Level 2 | Other      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 534 707  
Level 2 | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 0 0  
Level 2 | Private equity      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 0 0  
Level 2 | Hedge funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 30 36  
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 1,534 1,623 1,651
Level 3 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 0 0  
Level 3 | Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 0 0  
Level 3 | U.S. Treasuries and agencies      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 0 0  
Level 3 | Corporate bonds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 0 0  
Level 3 | International bonds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 0 0  
Level 3 | Other      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 0 0  
Level 3 | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 996 1,002 972
Level 3 | Private equity      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 512 569 569
Level 3 | Hedge funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount 26 52 $ 110
Investments measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets amount $ 4,432 $ 5,738