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Benefit Plans - Fair Value of Pension Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value $ 1,614 $ 2,466 $ 1,865
Significant Unobservable Inputs (Level 3) | Corporate bonds and other fixed-income securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 1,540 2,387 1,791
Significant Unobservable Inputs (Level 3) | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 70 74 70
Significant Unobservable Inputs (Level 3) | Private equity and other      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 4 5 $ 4
Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 8,538 12,724  
Pension Plans | Total Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 6,646 10,342  
Pension Plans | Total Fair Value | Total equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 964 1,552  
Pension Plans | Total Fair Value | U.S. equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 3 4  
Pension Plans | Total Fair Value | Non-U.S. equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 1 3  
Pension Plans | Total Fair Value | Pooled funds - equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 960 1,545  
Pension Plans | Total Fair Value | Total fixed-income securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 5,351 8,368  
Pension Plans | Total Fair Value | Government bonds      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 2,495 3,777  
Pension Plans | Total Fair Value | Pooled funds - fixed-income securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 560 648  
Pension Plans | Total Fair Value | Corporate bonds and other fixed-income securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 2,296 3,943  
Pension Plans | Total Fair Value | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 221 251  
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 | Other      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 102 162  
Pension Plans | Total Fair Value | Cash      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 4 5  
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 1,807 2,075  
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 910 1,091  
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 4  
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 3  
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 906 1,084  
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 645 644  
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 48 56  
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 453 449  
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 144 139  
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 152 179  
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) | Other      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 97 157  
Pension Plans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 3 4  
Pension Plans | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 3,225 5,801  
Pension Plans | Significant Other Observable Inputs (Level 2) | Total equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 54 461  
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 0  
Pension Plans | Significant Other Observable Inputs (Level 2) | Pooled funds - equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 54 461  
Pension Plans | Significant Other Observable Inputs (Level 2) | Total fixed-income securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 3,166 5,335  
Pension Plans | Significant Other Observable Inputs (Level 2) | Government bonds      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 2,447 3,721  
Pension Plans | Significant Other Observable Inputs (Level 2) | Pooled funds - fixed-income securities      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 107 199  
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 612 1,415  
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) | Other      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 5 5  
Pension Plans | Significant Other Observable Inputs (Level 2) | Cash      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 0 0  
Pension Plans | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 1,614 2,466  
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 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 1,540 2,389  
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 1,540 2,389  
Pension Plans | Significant Unobservable Inputs (Level 3) | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 69 72  
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) | Other      
Defined Benefit Plan Disclosure [Line Items]      
Total investments at fair value 0 0  
Pension Plans | Significant Unobservable Inputs (Level 3) | Cash      
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 $ 1,892 $ 2,382