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Retirement Plans (Schedule of Changes In Defined Benefit Plan Obligations) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Pension Benefits [Member] |  |  |
Change in benefit obligation: |  |  |
Benefit obligation at beginning of year | $ 629 | $ 880 |
Interest cost | 34 | 19 | $ 18
Actuarial loss (gain) | (46) | (215) |
Participant contributions | 0 | 0 |
Benefits paid | (54) | (55) |
Benefit obligation at end of year | 655 | 629 | 880
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | 458 | 671 |
Actual return on plan assets | (58) | (172) |
Employer contributions | 14 | 14 |
Participant contributions | 0 | 0 |
Benefits paid | (54) | (55) |
Fair value of plan assets at end of year | 476 | 458 | 671
Funded status at end of year | (179) | (171) |
Amounts recognized in balance sheet: |  |  |
Other current liabilities | (13) | (14) |
Other long-term liabilities | (166) | (157) |
Net amount | (179) | (171) |
Amounts recognized in accumulated other comprehensive earnings: |  |  |
Net actuarial loss (gain) | 198 | 189 |
Prior service cost | 0 | 0 |
Total | 198 | 189 |
Postretirement Benefits [Member] |  |  |
Change in benefit obligation: |  |  |
Benefit obligation at beginning of year | 7 | 12 |
Actuarial loss (gain) | (1) | (4) |
Participant contributions | 1 | 1 |
Benefits paid | (2) | (2) |
Benefit obligation at end of year | 7 | 7 | $ 12
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | 0 |  |
Employer contributions | 1 | 1 |
Participant contributions | 1 | 1 |
Benefits paid | (2) | (2) |
Fair value of plan assets at end of year | 0 | 0 |
Funded status at end of year | (7) | (7) |
Amounts recognized in balance sheet: |  |  |
Other current liabilities | (1) | (1) |
Other long-term liabilities | (6) | (6) |
Net amount | (7) | (7) |
Amounts recognized in accumulated other comprehensive earnings: |  |  |
Net actuarial loss (gain) | (14) | (15) |
Prior service cost | 1 | 1 |
Total | $ (13) | $ (14) |

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- Definition Amount of liability, recognized in statement of financial position, for defined benefit pension plan, classified as noncurrent. Excludes other postretirement benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480535/715-20-45-3 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(24)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480535/715-20-45-2 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (i-k) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-10A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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