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Employee Benefit Plans (Narrative) (Details) shares in Millions, $ in Millions |  | 12 Months Ended
--- | --- | ---
Apr. 01, 2021 USD ($) retirees | Dec. 31, 2023 USD ($) shares | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Number of retirees | retirees | 6,000 |  |  |
Pension settlement |  | $ 0 | $ 0 | $ (83)
Percentage of non-matching employer's contribution to eligible participants (as a percent) |  | 1.00% |  |
Employer's Common stock held under 401 (k) plan (in shares) | shares |  | 5.7 |  |
Market value of employer's Common stock held under 401 (k) plan |  | $ 414 |  |
Cash dividend received on employer's Common stock held under 401 (k) plan |  | 10 |  |
Increase (Decrease) in Obligation, Pension Benefits | $ 700 |  |  |
Pension Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension settlement |  | 0 | 0 | (83)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment |  | 0 | 2 | 0
Accumulated other comprehensive income, unrecognized prior service cost (credit) |  | (56) |  |
Accumulated other comprehensive income, unrecognized actuarial losses |  | 272 |  |
Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets, Aggregate Projected Benefit obligation |  | 1,500 | 1,300 |
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation |  | 1,500 | 1,200 |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation |  | 1,500 | 1,300 |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets |  | 1,000 | 900 |
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation |  | 1,500 | 1,200 |
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets |  | 1,000 | 800 |
Accumulated benefit obligation |  | 1,800 | 1,600 |
Contributions and expected future benefit payments |  | $ 27 |  |
Pension Benefits [Member] | Minimum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Amortization period of actuarial gains and losses |  | 4 years |  |
Pension Benefits [Member] | Maximum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Amortization period of actuarial gains and losses |  | 27 years |  |
Other Postretirement Benefits Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension settlement |  | $ 0 | 0 | 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment |  | 0 | $ 0 | $ 0
Accumulated other comprehensive income, unrecognized prior service cost (credit) |  | 1 |  |
Accumulated other comprehensive income, unrecognized actuarial losses |  | $ 20 |  |
Annual rate of increase in per capita cost of covered health care benefits assumed for transition period (as a percent) |  | 6.90% |  |
Annual rate for per capita cost of covered health care benefits assumed for 2025 and thereafter (as a percent) |  | 4.50% |  |
Year ultimate rate assumed for per capita cost of health care benefits is to be reached |  | 2031 |  |
Contributions and expected future benefit payments |  | $ 14 |  |
Other Postretirement Benefits Plan [Member] | Minimum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Amortization period of actuarial gains and losses |  | 5 years |  |
Other Postretirement Benefits Plan [Member] | Maximum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Amortization period of actuarial gains and losses |  | 18 years |  |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (l) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of accumulated benefit obligation for defined benefit pension plan with projected benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-3 + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from event reducing expected years of future service of present employees or eliminating accrual of defined benefits for some or all future services of present employees. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Publisher FASB -URI https://asc.fasb.org//1943274/2147480535/715-20-45-3A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(7) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(7) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-6 + Details
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