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Employee Benefits - Fair Value of Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | $ 1,464 | $ 2,231
Total |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 1,171 | 1,572
Level 1 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 11 | 12
Level 2 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 1,126 | 1,516
Level 3 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 34 | 44
Common collective trust funds measured at net asset value as a practical expedient |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 293 | 659
Cash and short-term investments | Total |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 5 | 6
Cash and short-term investments | Level 1 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 5 | 6
Cash and short-term investments | Level 2 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 0 | 0
Cash and short-term investments | Level 3 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 0 | 0
U.S. indexes | Total |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 6 | 6
U.S. indexes | Level 1 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 6 | 6
U.S. indexes | Level 2 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 0 | 0
U.S. indexes | Level 3 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 0 | 0
Long duration strategy | Total |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 1,007 | 1,376
Long duration strategy | Level 1 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 0 | 0
Long duration strategy | Level 2 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 1,007 | 1,376
Long duration strategy | Level 3 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 0 | 0
Intermediate duration securities | Total |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 38 | 59
Intermediate duration securities | Level 1 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 0 | 0
Intermediate duration securities | Level 2 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 38 | 59
Intermediate duration securities | Level 3 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 0 | 0
Real Estate: U.K. | Total |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 34 | 44
Real Estate: U.K. | Level 1 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 0 | 0
Real Estate: U.K. | Level 2 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 0 | 0
Real Estate: U.K. | Level 3 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 34 | 44
Infrastructure: U.K. | Total |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 81 | 81
Infrastructure: U.K. | Level 1 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 0 | 0
Infrastructure: U.K. | Level 2 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | 81 | 81
Infrastructure: U.K. | Level 3 |  |
Fair value of defined benefit plans assets by asset class |  |
Fair value of plan assets | $ 0 | $ 0

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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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