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Employee Benefit Plans (Reconciliation of Changes in Projected Benefit Obligation and Change in Plan Assets) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, beginning balance | $ 5,400 |  |
Fair value of plan assets, end balance | 5,615 | $ 5,400 |
Pension Plans | Qualified Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation at end of year | 4,601 | 4,517 |
Projected benefit obligation at beginning of year | 4,543 | 5,423 |
Service cost | 130 | 142 | $ 133
Interest cost | 249 | 156 | 139
Amendments |  |  |
Actuarial (gains)/losses and changes in assumptions | 45 | (833) |
Benefits paid | (326) | (345) |
Projected benefit obligation at end of year | 4,641 | 4,543 | 5,423
Fair value of plan assets, beginning balance | 5,400 | 6,788 |
Actual return on plan assets | 541 | (1,043) |
Benefits paid | (326) | (345) |
Fair value of plan assets, end balance | 5,615 | 5,400 | 6,788
Funded status | 974 | 857 |
Noncurrent asset | 974 | 857 |
Net amount recognized on the consolidated balance sheet | 974 | 857 |
Prior service cost (credit) | 11 | 14 |
Net actuarial loss (gain) | 148 | 322 |
Amount recognized in AOCI | 159 | 336 |
Pension Plans | Nonqualified Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation at end of year | 212 | 219 |
Projected benefit obligation at beginning of year | 222 | 280 |
Service cost | 3 | 3 | 4
Interest cost | 11 | 7 | 6
Actuarial (gains)/losses and changes in assumptions | 3 | (44) |
Benefits paid | (22) | (24) |
Projected benefit obligation at end of year | 217 | 222 | 280
Fair value of plan assets, beginning balance |  |  |
Employer contribution | 22 | 24 |
Benefits paid | (22) | (24) |
Fair value of plan assets, end balance |  |  |
Funded status | (217) | (222) |
Current liability | (23) | (24) |
Noncurrent liability | (194) | (198) |
Net amount recognized on the consolidated balance sheet | (217) | (222) |
Net actuarial loss (gain) | 33 | 31 |
Amount recognized in AOCI | 33 | 31 |
Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected benefit obligation at beginning of year | 260 | 326 |
Service cost | 3 | 4 | 4
Interest cost | 14 | 9 | 8
Actuarial (gains)/losses and changes in assumptions | 7 | (57) |
Participant contributions | 2 | 2 |
Federal Medicare subsidy on benefits paid |  | 1 |
Benefits paid | (25) | (25) |
Projected benefit obligation at end of year | 261 | 260 | 326
Fair value of plan assets, beginning balance | 242 | 263 |
Actual return on plan assets | 16 | (21) |
Employer contribution | 22 | 22 |
Participant contributions | 2 | 2 |
Federal Medicare subsidy on benefits paid |  | 1 |
Benefits paid | (25) | (25) |
Fair value of plan assets, end balance | 257 | 242 | $ 263
Funded status | (4) | (18) |
Noncurrent asset | 26 | 10 |
Current liability | (3) | (3) |
Noncurrent liability | (27) | (25) |
Net amount recognized on the consolidated balance sheet | (4) | (18) |
Prior service cost (credit) | 1 | 1 |
Net actuarial loss (gain) | (31) | (32) |
Amount recognized in AOCI | $ (30) | $ (31) |

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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 Amount of increase (decrease) in accumulated benefit obligation from change in existing term of defined benefit plan or initiation of new defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (r) -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 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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- 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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