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Benefit Plans - Fair Value of Pension Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value $ 1,536 $ 1,614 $ 2,466
Significant Unobservable Inputs (Level 3) | Corporate bonds and other fixed-income securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 1,471 1,540 2,387
Significant Unobservable Inputs (Level 3) | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 62 70 74
Significant Unobservable Inputs (Level 3) | Private equity      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 3 4 $ 5
Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 9,087 8,538  
Pension Plans | Total Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 7,003 6,646  
Pension Plans | Total Fair Value | Total equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 938 964  
Pension Plans | Total Fair Value | U.S. equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 3 3  
Pension Plans | Total Fair Value | Non-U.S. equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value   1  
Pension Plans | Total Fair Value | Pooled funds - equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 935 960  
Pension Plans | Total Fair Value | Total fixed-income securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 5,690 5,351  
Pension Plans | Total Fair Value | Government bonds      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 2,485 2,495  
Pension Plans | Total Fair Value | Pooled funds - fixed-income securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 839 560  
Pension Plans | Total Fair Value | Corporate bonds and other fixed-income securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 2,366 2,296  
Pension Plans | Total Fair Value | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 249 221  
Pension Plans | Total Fair Value | Private equity      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 4 4  
Pension Plans | Total Fair Value | Cash and other      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 122 106  
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 2,131 1,807  
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Total equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 866 910  
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 3 3  
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-U.S. equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value   1  
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pooled funds - equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 863 906  
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Total fixed-income securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 980 645  
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Government bonds      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 59 48  
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pooled funds - fixed-income securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 718 453  
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate bonds and other fixed-income securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 203 144  
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 182 152  
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Private equity      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 0 0  
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash and other      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 103 100  
Pension Plans | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 3,336 3,225  
Pension Plans | Significant Other Observable Inputs (Level 2) | Total equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 72 54  
Pension Plans | Significant Other Observable Inputs (Level 2) | U.S. equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 0 0  
Pension Plans | Significant Other Observable Inputs (Level 2) | Non-U.S. equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value   0  
Pension Plans | Significant Other Observable Inputs (Level 2) | Pooled funds - equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 72 54  
Pension Plans | Significant Other Observable Inputs (Level 2) | Total fixed-income securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 3,246 3,166  
Pension Plans | Significant Other Observable Inputs (Level 2) | Government bonds      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 2,426 2,447  
Pension Plans | Significant Other Observable Inputs (Level 2) | Pooled funds - fixed-income securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 121 107  
Pension Plans | Significant Other Observable Inputs (Level 2) | Corporate bonds and other fixed-income securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 699 612  
Pension Plans | Significant Other Observable Inputs (Level 2) | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 0 0  
Pension Plans | Significant Other Observable Inputs (Level 2) | Private equity      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 0 0  
Pension Plans | Significant Other Observable Inputs (Level 2) | Cash and other      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 18 5  
Pension Plans | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 1,536 1,614  
Pension Plans | Significant Unobservable Inputs (Level 3) | Total equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 0 0  
Pension Plans | Significant Unobservable Inputs (Level 3) | U.S. equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 0 0  
Pension Plans | Significant Unobservable Inputs (Level 3) | Non-U.S. equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value   0  
Pension Plans | Significant Unobservable Inputs (Level 3) | Pooled funds - equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 0 0  
Pension Plans | Significant Unobservable Inputs (Level 3) | Total fixed-income securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 1,464 1,540  
Pension Plans | Significant Unobservable Inputs (Level 3) | Government bonds      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 0 0  
Pension Plans | Significant Unobservable Inputs (Level 3) | Pooled funds - fixed-income securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 0 0  
Pension Plans | Significant Unobservable Inputs (Level 3) | Corporate bonds and other fixed-income securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 1,464 1,540  
Pension Plans | Significant Unobservable Inputs (Level 3) | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 67 69  
Pension Plans | Significant Unobservable Inputs (Level 3) | Private equity      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 4 4  
Pension Plans | Significant Unobservable Inputs (Level 3) | Cash and other      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 1 1  
Pension Plans | Investments measured at net asset value      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value $ 2,084 $ 1,892