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Employee Benefits Schedule of Defined Benefit Plan Disclosures (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Fair value of plan assets: |  |  |
Actuarial loss (gain) | $ (15) |  |
Defined Benefit Plan, Plan Assets, Benefits Paid | (1) |  |
Defined Benefit Plan, Plan Assets, Payment for Settlement | (11) | $ (13) |
Classification in consolidated balance sheet: |  |  |
Noncurrent asset | (35) | (38) |
Pension Plans, Defined Benefit [Member] |  |  |
Benefit obligation: |  |  |
As of January 1 | 690 | 695 | $ 972
Fair value of plan assets: |  |  |
Service cost | 10 | 17 | 19
Interest cost on benefit obligation | 37 | 28 | 27
Actuarial loss (gain) | 37 | (255) |
Benefit payments | (86) | (69) |
Defined Benefit Plan, Plan Assets, Administration Expense | (3) | (3) |
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment | 0 | (5) |
As of January 1 | 530 | 547 | 800
Defined Benefit Plan, Funded (Unfunded) Status of Plan | (160) | (148) |
Net actuarial loss (gain) included in comprehensive income | 8 | (28) |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment | 0 | 0 | 0
Other Postretirement Benefits Cost (Reversal of Cost) | (1) | (1) |
Defined Benefit Plan, Amortization of Gain (Loss) | 0 | (15) | $ (22)
Total Amounts included in comprehensive income | 9 | (36) |
Defined Benefit Plan, Accumulated Benefit Obligation | 645 | 656 |
Actual return on plan assets | 72 | (181) |
Company contributions | 0 | 0 |
Classification in consolidated balance sheet: |  |  |
Noncurrent asset | 0 | 0 |
Current liability | 0 | 0 |
Noncurrent liability | (160) | (148) |
Amounts included in AOCL: |  |  |
Net actuarial loss | 105 | 96 |
Prior service cost | 0 | (5) |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax | $ 104 | $ 95 |
Assumptions used: |  |  |
Discount rate used to calculate benefit obligation | 5.42% | 2.92% |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase | 4.19% | 4.21% | 4.26%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 6.75% | 6.75% |
Defined Benefit Plan, Benefit Obligation, Changes Between Actual and Expected Return on Plan Assets, Gains | $ 227 |  |
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | 1 | $ 2 | $ 0
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair value of plan assets: |  |  |
As of January 1 | 0 | 0 |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value of plan assets: |  |  |
As of January 1 | 14 | 16 |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair value of plan assets: |  |  |
As of January 1 | 0 | 0 |
Other Postretirement Benefit Plans [Member] |  |  |
Benefit obligation: |  |  |
As of January 1 | 35 | 43 | 71
Fair value of plan assets: |  |  |
Service cost | 1 | 1 | 2
Interest cost on benefit obligation | 2 | 2 | 2
Actuarial loss (gain) | (3) | 15 |
Benefit payments | (2) | (4) |
Defined Benefit Plan, Plan Assets, Administration Expense | 0 | 0 |
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment | 0 | (1) |
As of January 1 | 23 | 21 | 37
Defined Benefit Plan, Funded (Unfunded) Status of Plan | (12) | (22) |
Net actuarial loss (gain) included in comprehensive income | 2 | (8) |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment | 1 | 11 |
Other Postretirement Benefits Cost (Reversal of Cost) | 0 | 0 |
Defined Benefit Plan, Amortization of Gain (Loss) | 1 | 0 | $ 0
Total Amounts included in comprehensive income | 4 | 3 |
Actual return on plan assets | 2 | (6) |
Company contributions | 13 | 7 |
Classification in consolidated balance sheet: |  |  |
Noncurrent asset | 0 | 0 |
Current liability | 0 | (1) |
Noncurrent liability | (12) | (21) |
Amounts included in AOCL: |  |  |
Net actuarial loss | (3) | (7) |
Prior service cost | 0 | 0 |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax | $ (3) | $ (7) |
Assumptions used: |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase | 4.06% | 4.04% | 4.13%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 4.77% | 4.83% |
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | $ 0 | $ 0 | $ 1
Other Postretirement Benefit Plans [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair value of plan assets: |  |  |
As of January 1 | 0 | 0 |
Other Postretirement Benefit Plans [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair value of plan assets: |  |  |
As of January 1 | 7 | 7 |
Other Postretirement Benefit Plans [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair value of plan assets: |  |  |
As of January 1 | 6 | 6 |
Non Qualified Benefit Plans [Member] |  |  |
Benefit obligation: |  |  |
As of January 1 | 18 | 18 | 27
Fair value of plan assets: |  |  |
Service cost | 0 | 0 | 0
Interest cost on benefit obligation | 1 | 1 | 1
Actuarial loss (gain) | (2) | 7 |
Benefit payments | (3) | (3) |
Defined Benefit Plan, Plan Assets, Administration Expense | 0 | 0 |
As of January 1 | 17 | 19 | 21
Defined Benefit Plan, Funded (Unfunded) Status of Plan | (1) | 1 |
Net actuarial loss (gain) included in comprehensive income | 2 | (7) |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment | 0 | 0 | 0
Other Postretirement Benefits Cost (Reversal of Cost) | 0 | 0 |
Defined Benefit Plan, Amortization of Gain (Loss) | (1) | (1) | $ (1)
Total Amounts included in comprehensive income | 1 | (8) |
Defined Benefit Plan, Accumulated Benefit Obligation | 17 | 17 |
Actual return on plan assets | (2) | (2) |
Company contributions | 3 | 3 |
Classification in consolidated balance sheet: |  |  |
Noncurrent asset | (17) | (19) |
Current liability | (2) | (2) |
Noncurrent liability | (16) | (16) |
Amounts included in AOCL: |  |  |
Net actuarial loss | 7 | 6 |
Prior service cost | 0 | 0 |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax | $ 7 | $ 6 |
Assumptions used: |  |  |
Discount rate used to calculate benefit obligation | 5.42% | 2.92% |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase | 4.01% | 5.10% | 4.10%
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | $ 0 | $ 0 | $ 0

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- Definition The net increase or decrease of changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.included in comprehensive income + References No definition available. + Details
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- Definition The amount of cash, securities, or other assets held by a third-party trustee pursuant to the terms of an agreement which assets are available to be used by beneficiaries to that agreement only within the specific terms thereof and which agreement is expected to terminate more than one year from the balance sheet date (or operating cycle, if longer) at which time the assets held-in-trust will be released or forfeited. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 60 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480266/715-60-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(6) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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