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Employee Benefit Plans (Schedule of Allocation of Plan Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | $ 48,945 | $ 47,960 |
Quoted price in active markets (Level 1) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 9,663 | 8,688 |
Significant other observable inputs (Level 2) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 16,761 | 15,003 |
Significant Unobservable Inputs (Level 3) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 1,467 | 1,650 | $ 1,885
Fair Value Measured at Net Asset Value Per Share |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 21,088 | 21,810 |
Global Equities [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 6,160 | 6,199 |
Global Equities [Member] | Quoted price in active markets (Level 1) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 6,156 | 6,194 |
Global Equities [Member] | Significant other observable inputs (Level 2) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 4 | 5 |
Global Equities [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Global Equities [Member] | Fair Value Measured at Net Asset Value Per Share |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Global Equity Commingled Funds [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 1,012 | 588 |
Global Equity Commingled Funds [Member] | Quoted price in active markets (Level 1) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 0 | 20 |
Global Equity Commingled Funds [Member] | Significant other observable inputs (Level 2) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 1,012 | 568 |
Global Equity Commingled Funds [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Global Equity Commingled Funds [Member] | Fair Value Measured at Net Asset Value Per Share |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Enhanced Global Equities [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 0 | 22 |
Enhanced Global Equities [Member] | Quoted price in active markets (Level 1) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 0 | (53) |
Enhanced Global Equities [Member] | Significant other observable inputs (Level 2) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 0 | 75 |
Enhanced Global Equities [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Enhanced Global Equities [Member] | Fair Value Measured at Net Asset Value Per Share |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Other Public Equities |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 2,308 | 5,771 |
Other Public Equities | Quoted price in active markets (Level 1) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Other Public Equities | Significant other observable inputs (Level 2) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Other Public Equities | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Other Public Equities | Fair Value Measured at Net Asset Value Per Share |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 2,308 | 5,771 |
Private Equity Funds [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 4,936 | 4,068 |
Private Equity Funds [Member] | Quoted price in active markets (Level 1) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Private Equity Funds [Member] | Significant other observable inputs (Level 2) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Private Equity Funds [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Private Equity Funds [Member] | Fair Value Measured at Net Asset Value Per Share |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 4,936 | 4,068 |
Governments [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 5,067 | 3,952 |
Governments [Member] | Quoted price in active markets (Level 1) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 3,507 | 2,526 |
Governments [Member] | Significant other observable inputs (Level 2) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 1,560 | 1,426 |
Governments [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Governments [Member] | Fair Value Measured at Net Asset Value Per Share |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Corporate Debt Securities [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 13,185 | 12,639 |
Corporate Debt Securities [Member] | Quoted price in active markets (Level 1) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 0 | 1 |
Corporate Debt Securities [Member] | Significant other observable inputs (Level 2) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 13,185 | 12,638 |
Corporate Debt Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Corporate Debt Securities [Member] | Fair Value Measured at Net Asset Value Per Share |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Structured Products |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 57 | 57 |
Structured Products | Quoted price in active markets (Level 1) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Structured Products | Significant other observable inputs (Level 2) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 57 | 57 |
Structured Products | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Structured Products | Fair Value Measured at Net Asset Value Per Share |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Fixed Income Securities [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 9,669 | 6,975 |
Fixed Income Securities [Member] | Quoted price in active markets (Level 1) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Fixed Income Securities [Member] | Significant other observable inputs (Level 2) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Fixed Income Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Fixed Income Securities [Member] | Fair Value Measured at Net Asset Value Per Share |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 9,669 | 6,975 |
Real Estate [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 3,099 | 3,411 |
Real Estate [Member] | Quoted price in active markets (Level 1) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Real Estate [Member] | Significant other observable inputs (Level 2) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Real Estate [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 1,467 | 1,650 |
Real Estate [Member] | Fair Value Measured at Net Asset Value Per Share |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 1,632 | 1,761 |
Other Pension Plan Assets [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 2,975 | 3,155 |
Other Pension Plan Assets [Member] | Quoted price in active markets (Level 1) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Other Pension Plan Assets [Member] | Significant other observable inputs (Level 2) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 560 | 84 |
Other Pension Plan Assets [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Other Pension Plan Assets [Member] | Fair Value Measured at Net Asset Value Per Share |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 2,415 | 3,071 |
Cash & Cash Equivalents [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 511 | 314 |
Cash & Cash Equivalents [Member] | Quoted price in active markets (Level 1) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Cash & Cash Equivalents [Member] | Significant other observable inputs (Level 2) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 383 | 150 |
Cash & Cash Equivalents [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Cash & Cash Equivalents [Member] | Fair Value Measured at Net Asset Value Per Share |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 128 | 164 |
Pension Plan Assets Leveled [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan asset, subtotal | 48,979 | 47,151 |
Other Assets And Liabilities [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | $ (34) | $ 809 |

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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + 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 (d)(iv)(02) -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 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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