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Employee Benefit Plans - Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets $ 177 $ 204 $ 93
U.S.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 7,942 9,919  
U.S. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 2,370 3,268  
U.S. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 851 1,027  
U.S. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 54 48  
U.S. | NAV      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 4,667 5,576  
Int’l.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 3,286 4,950  
Int’l. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 515 1,091  
Int’l. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 483 735  
Int’l. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 123 156  
Int’l. | NAV      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 2,165 2,968  
U.S. | U.S.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 1,358 1,677  
U.S. | U.S. | Company's Own Stock      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
U.S. | U.S. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 1,358 1,677  
U.S. | U.S. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
U.S. | U.S. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
U.S. | U.S. | NAV      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
U.S. | Int’l.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 164 491  
U.S. | Int’l. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 164 491  
U.S. | Int’l. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
U.S. | Int’l. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
U.S. | Int’l. | NAV      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
International | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 1 1
International | U.S.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 946 1,285  
International | U.S. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 946 1,284  
International | U.S. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
International | U.S. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 1  
International | U.S. | NAV      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
International | Int’l.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 120 356  
International | Int’l. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 120 355  
International | Int’l. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
International | Int’l. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 1  
International | Int’l. | NAV      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Collective Trusts/Mutual Funds | U.S.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 1,695 2,541  
Collective Trusts/Mutual Funds | U.S. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 4 32  
Collective Trusts/Mutual Funds | U.S. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Collective Trusts/Mutual Funds | U.S. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Collective Trusts/Mutual Funds | U.S. | NAV      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 1,691 2,509  
Collective Trusts/Mutual Funds | Int’l.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 87 134  
Collective Trusts/Mutual Funds | Int’l. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 6 6  
Collective Trusts/Mutual Funds | Int’l. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Collective Trusts/Mutual Funds | Int’l. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Collective Trusts/Mutual Funds | Int’l. | NAV      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 81 128  
Government | U.S.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 110 215  
Government | U.S. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Government | U.S. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 110 215  
Government | U.S. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Government | U.S. | NAV      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Government | Int’l.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 185 229  
Government | Int’l. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 127 135  
Government | Int’l. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 58 94  
Government | Int’l. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Government | Int’l. | NAV      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Corporate | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0 0
Corporate | U.S.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 680 660  
Corporate | U.S. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Corporate | U.S. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 680 660  
Corporate | U.S. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Corporate | U.S. | NAV      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Corporate | Int’l.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 343 532  
Corporate | Int’l. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 15 2  
Corporate | Int’l. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 328 530  
Corporate | Int’l. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Corporate | Int’l. | NAV      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Bank Loans | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0 2
Bank Loans | U.S.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 45 137  
Bank Loans | U.S. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Bank Loans | U.S. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 45 136  
Bank Loans | U.S. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 1  
Bank Loans | U.S. | NAV      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Bank Loans | Int’l.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Bank Loans | Int’l. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Bank Loans | Int’l. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Bank Loans | Int’l. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Bank Loans | Int’l. | NAV      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Mortgage/Asset Backed | U.S.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 1 1  
Mortgage/Asset Backed | U.S. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Mortgage/Asset Backed | U.S. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 1 1  
Mortgage/Asset Backed | U.S. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Mortgage/Asset Backed | U.S. | NAV      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Mortgage/Asset Backed | Int’l.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 4 4  
Mortgage/Asset Backed | Int’l. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Mortgage/Asset Backed | Int’l. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 4 4  
Mortgage/Asset Backed | Int’l. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Mortgage/Asset Backed | Int’l. | NAV      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Collective Trusts/Mutual Funds | U.S.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 1,616 1,907  
Collective Trusts/Mutual Funds | U.S. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 13  
Collective Trusts/Mutual Funds | U.S. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Collective Trusts/Mutual Funds | U.S. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Collective Trusts/Mutual Funds | U.S. | NAV      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 1,616 1,894  
Collective Trusts/Mutual Funds | Int’l.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 1,750 2,388  
Collective Trusts/Mutual Funds | Int’l. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 1  
Collective Trusts/Mutual Funds | Int’l. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Collective Trusts/Mutual Funds | Int’l. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Collective Trusts/Mutual Funds | Int’l. | NAV      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 1,750 2,387  
Mixed Funds | U.S.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Mixed Funds | U.S. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Mixed Funds | U.S. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Mixed Funds | U.S. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Mixed Funds | U.S. | NAV      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Mixed Funds | Int’l.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 87 99  
Mixed Funds | Int’l. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 14 12  
Mixed Funds | Int’l. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 73 87  
Mixed Funds | Int’l. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Mixed Funds | Int’l. | NAV      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Real Estate | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 38 42 45
Real Estate | U.S.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 1,184 1,172  
Real Estate | U.S. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Real Estate | U.S. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Real Estate | U.S. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Real Estate | U.S. | NAV      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 1,184 1,172  
Real Estate | Int’l.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 198 312  
Real Estate | Int’l. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Real Estate | Int’l. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Real Estate | Int’l. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 38 42  
Real Estate | Int’l. | NAV      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 160 270  
Alternative Investments | U.S.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Alternative Investments | U.S. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Alternative Investments | U.S. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Alternative Investments | U.S. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Alternative Investments | U.S. | NAV      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Alternative Investments | Int’l.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Alternative Investments | Int’l. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Alternative Investments | Int’l. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Alternative Investments | Int’l. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Alternative Investments | Int’l. | NAV      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Cash and Cash Equivalents | U.S.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 200 264  
Cash and Cash Equivalents | U.S. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 25 263  
Cash and Cash Equivalents | U.S. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 1  
Cash and Cash Equivalents | U.S. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Cash and Cash Equivalents | U.S. | NAV      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 175 0  
Cash and Cash Equivalents | Int’l.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 80 161  
Cash and Cash Equivalents | Int’l. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 69 89  
Cash and Cash Equivalents | Int’l. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 2 3  
Cash and Cash Equivalents | Int’l. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Cash and Cash Equivalents | Int’l. | NAV      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 9 69  
Other | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 139 161 $ 45
Other | U.S.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 107 60  
Other | U.S. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 37 (1)  
Other | U.S. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 15 14  
Other | U.S. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 54 46  
Other | U.S. | NAV      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 1 1  
Other | Int’l.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 268 244  
Other | Int’l. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Other | Int’l. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 18 17  
Other | Int’l. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 85 113  
Other | Int’l. | NAV      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets $ 165 $ 114