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Postretirement Benefit Plans (Summary of Plan Assets, Benefit Obligation and Funded Status) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | $ 246 | $ 679 |
Projected benefit obligation | (513) | (1,085) |
Unfunded status of the plans | (267) | (406) |
Amounts recognized in the balance sheet |  |  |
Other non-current assets | 34 | 48 |
Accrued and other current liabilities | (15) | (16) |
Accrued post-retirement benefit obligations | (286) | (438) |
Net amount recognized | (267) | (406) |
Accumulated other comprehensive income: |  |  |
Net actuarial losses | (56) | (343) |
Prior service credit | 3 | 3 |
Total | (53) | (340) |
Pension |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 246 | 679 |
Projected benefit obligation | (482) | (1,043) |
Unfunded status of the plans | (236) | (364) |
Amounts recognized in the balance sheet |  |  |
Other non-current assets | 34 | 48 |
Accrued and other current liabilities | (12) | (13) |
Accrued post-retirement benefit obligations | (258) | (399) |
Net amount recognized | (236) | (364) |
Accumulated other comprehensive income: |  |  |
Net actuarial losses | (50) | (326) |
Prior service credit | (1) | (4) |
Total | (51) | (330) |
Other Benefits |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Projected benefit obligation | (31) | (42) | $ (44)
Unfunded status of the plans | (31) | (42) |
Amounts recognized in the balance sheet |  |  |
Other non-current assets | 0 | 0 |
Accrued and other current liabilities | (3) | (3) |
Accrued post-retirement benefit obligations | (28) | (39) |
Net amount recognized | (31) | (42) |
Accumulated other comprehensive income: |  |  |
Net actuarial losses | (6) | (17) |
Prior service credit | 4 | 7 |
Total | (2) | (10) |
Level 1 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 40 | 50 |
Level 2 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 135 | 185 |
Level 3 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 20 | 368 | $ 384
NAV Practical Expedient |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | $ 51 | $ 76 |

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + 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 (j) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580 + Details
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