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Employee Benefit Plans - Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Level 3 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | $ 93 | $ 112 | $ 129
U.S. |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 9,930 | 10,177 |
U.S. | Level 1 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 4,747 | 4,002 |
U.S. | Level 2 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 1,171 | 2,117 |
U.S. | Level 3 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 44 | 51 |
U.S. | NAV |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 3,968 | 4,007 |
Int’l. |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 5,363 | 4,791 |
Int’l. | Level 1 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 1,406 | 1,388 |
Int’l. | Level 2 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 798 | 715 |
Int’l. | Level 3 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 49 | 61 |
Int’l. | NAV |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 3,110 | 2,627 |
U.S. | U.S. |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 2,286 | 1,769 |
U.S. | U.S. | Company's Own Stock [Member] |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 4 | 6 |
U.S. | U.S. | Level 1 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 2,286 | 1,769 |
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 | 443 | 471 |
U.S. | Int’l. | Level 1 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 443 | 471 |
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 | 1 | 1 | 1
International | U.S. |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 2,211 | 1,958 |
International | U.S. | Level 1 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 2,210 | 1,958 |
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 | 1 | 0 |
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 | 373 | 422 |
International | Int’l. | Level 1 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 373 | 421 |
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 | 1,107 | 1,079 |
Collective Trusts/Mutual Funds | U.S. | Level 1 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 48 | 52 |
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 | 1,059 | 1,027 |
Collective Trusts/Mutual Funds | Int’l. |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 192 | 184 |
Collective Trusts/Mutual Funds | Int’l. | Level 1 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 7 | 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 | 185 | 178 |
Government | U.S. |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 231 | 523 |
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 | 231 | 523 |
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 | 240 | 265 |
Government | Int’l. | Level 1 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 125 | 144 |
Government | Int’l. | Level 2 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 115 | 121 |
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 | 3 | 21
Corporate | U.S. |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 778 | 1,444 |
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 | 778 | 1,444 |
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 | 578 | 493 |
Corporate | Int’l. | Level 1 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 10 | 0 |
Corporate | Int’l. | Level 2 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 568 | 490 |
Corporate | Int’l. | Level 3 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 0 | 3 |
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 | 2 | 7 | 5
Bank Loans | U.S. |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 129 | 120 |
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 | 127 | 113 |
Bank Loans | U.S. | Level 3 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 2 | 7 |
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 | 1,901 | 963 |
Collective Trusts/Mutual Funds | U.S. | Level 1 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 13 | 0 |
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 | 1,888 | 963 |
Collective Trusts/Mutual Funds | Int’l. |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 2,520 | 2,230 |
Collective Trusts/Mutual Funds | Int’l. | Level 1 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 4 | 5 |
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 | 2,516 | 2,225 |
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 | 127 | 84 |
Mixed Funds | Int’l. | Level 1 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 38 | 7 |
Mixed Funds | Int’l. | Level 2 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 89 | 77 |
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 | 45 | 55 | 56
Real Estate | U.S. |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 1,018 | 1,089 |
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 | 1,018 | 1,089 |
Real Estate | Int’l. |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 448 | 277 |
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 | 45 | 55 |
Real Estate | Int’l. | NAV |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 403 | 222 |
Alternative Investments | U.S. |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 0 | 924 |
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 | 924 |
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 | 221 | 235 |
Cash and Cash Equivalents | U.S. | Level 1 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 209 | 228 |
Cash and Cash Equivalents | U.S. | Level 2 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 12 | 7 |
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 | 0 | 0 |
Cash and Cash Equivalents | Int’l. |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 417 | 338 |
Cash and Cash Equivalents | Int’l. | Level 1 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 408 | 334 |
Cash and Cash Equivalents | Int’l. | Level 2 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 3 | 2 |
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 | 6 | 2 |
Other | Level 3 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 45 | 46 | $ 46
Other | U.S. |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 47 | 72 |
Other | U.S. | Level 1 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | (19) | (5) |
Other | U.S. | Level 2 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 22 | 29 |
Other | U.S. | Level 3 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 41 | 44 |
Other | U.S. | NAV |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 3 | 4 |
Other | Int’l. |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 21 | 23 |
Other | Int’l. | Level 1 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | (2) | 0 |
Other | Int’l. | Level 2 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 19 | 21 |
Other | Int’l. | Level 3 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 4 | 2 |
Other | Int’l. | NAV |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | $ 0 | $ 0 |

X
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