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Pension and Other Postretirement Benefit Plans - Fair Values of Pension Plan Assets (Details) - Pension Benefits - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 765 $ 943  
United States      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 9,094 13,067 $ 12,672
United States | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 147 292  
United States | Developed markets equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,654 4,035  
United States | Emerging markets equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 707 919  
United States | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 131 0  
United States | Developed markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,956 2,915  
United States | Government and agency obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,934 2,870  
United States | Corporate obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,438 2,005  
United States | Mortgage and asset-backed securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 22 23  
United States | Derivatives      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 101 0  
United States | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4 8  
United States | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,216 3,156  
United States | Level 1 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 49 3  
United States | Level 1 | Developed markets equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 211 236  
United States | Level 1 | Emerging markets equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Level 1 | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Level 1 | Developed markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,956 2,915  
United States | Level 1 | Government and agency obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Level 1 | Corporate obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Level 1 | Mortgage and asset-backed securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Level 1 | Derivatives      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Level 1 | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 2  
United States | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3,495 4,898  
United States | Level 2 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Level 2 | Developed markets equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Level 2 | Emerging markets equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Level 2 | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Level 2 | Developed markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Level 2 | Government and agency obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,934 2,870  
United States | Level 2 | Corporate obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,438 2,005  
United States | Level 2 | Mortgage and asset-backed securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 22 23  
United States | Level 2 | Derivatives      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 101 0  
United States | Level 2 | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4 6 7
United States | Level 3 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Level 3 | Developed markets equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Level 3 | Emerging markets equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Level 3 | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Level 3 | Developed markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Level 3 | Government and agency obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Level 3 | Corporate obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Level 3 | Mortgage and asset-backed securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Level 3 | Derivatives      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Level 3 | Insurance contracts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0 0
United States | Level 3 | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4 6 7
United States | NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3,379 5,007  
United States | NAV | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 98 289  
United States | NAV | Developed markets equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,443 3,799  
United States | NAV | Emerging markets equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 707 919  
United States | NAV | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 131 0  
United States | NAV | Developed markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | NAV | Government and agency obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | NAV | Corporate obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | NAV | Mortgage and asset-backed securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | NAV | Derivatives      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | NAV | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 8,473 12,195 12,009
International | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 78 110  
International | Developed markets equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3,422 4,944  
International | Emerging markets equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 111 209  
International | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 11 17  
International | Government and agency obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,963 4,436  
International | Corporate obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 146 188  
International | Other fixed income obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 21 26  
International | Developed markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 263 369  
International | Government and agency obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 448 597  
International | Corporate obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 157 225  
International | Mortgage and asset-backed securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 69 90  
International | Insurance contracts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 780 982  
International | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4 2  
International | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 943 1,387  
International | Level 1 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 57 82  
International | Level 1 | Developed markets equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 375 531  
International | Level 1 | Emerging markets equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 52 137  
International | Level 1 | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International | Level 1 | Government and agency obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 177 240  
International | Level 1 | Corporate obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 8 9  
International | Level 1 | Other fixed income obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 10 15  
International | Level 1 | Developed markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 263 369  
International | Level 1 | Government and agency obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 3  
International | Level 1 | Corporate obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International | Level 1 | Mortgage and asset-backed securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International | Level 1 | Insurance contracts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International | Level 1 | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 1  
International | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 6,333 9,293  
International | Level 2 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 8 10  
International | Level 2 | Developed markets equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,957 4,292  
International | Level 2 | Emerging markets equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International | Level 2 | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 1  
International | Level 2 | Government and agency obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,656 4,025  
International | Level 2 | Corporate obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 9 8  
International | Level 2 | Other fixed income obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7 8  
International | Level 2 | Developed markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International | Level 2 | Government and agency obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 448 591  
International | Level 2 | Corporate obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 157 223  
International | Level 2 | Mortgage and asset-backed securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 69 90  
International | Level 2 | Insurance contracts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 18 44  
International | Level 2 | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3 1  
International | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 761 937 935
International | Level 3 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International | Level 3 | Developed markets equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International | Level 3 | Emerging markets equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International | Level 3 | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International | Level 3 | Government and agency obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International | Level 3 | Corporate obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International | Level 3 | Other fixed income obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International | Level 3 | Developed markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International | Level 3 | Government and agency obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International | Level 3 | Corporate obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International | Level 3 | Mortgage and asset-backed securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International | Level 3 | Insurance contracts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 761 937 935
International | Level 3 | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0 $ 0
International | NAV      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 436 578  
International | NAV | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 13 18  
International | NAV | Developed markets equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 90 121  
International | NAV | Emerging markets equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 59 72  
International | NAV | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 10 16  
International | NAV | Government and agency obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 130 171  
International | NAV | Corporate obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 129 171  
International | NAV | Other fixed income obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4 3  
International | NAV | Developed markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International | NAV | Government and agency obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 3  
International | NAV | Corporate obligations      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 2  
International | NAV | Mortgage and asset-backed securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International | NAV | Insurance contracts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 1  
International | NAV | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 0 $ 0