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Employee Benefit Plans (Schedule of Allocation of Plan Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | $ 47,960 | $ 63,323 |
Quoted price in active markets (Level 1) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 8,688 | 11,394 |
Significant other observable inputs (Level 2) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 15,003 | 21,178 |
Significant Unobservable Inputs (Level 3) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 1,650 | 1,885 | $ 1,649
Fair Value Measured at Net Asset Value Per Share |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 21,810 | 27,666 |
Global Equities [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 6,199 | 9,417 |
Global Equities [Member] | Quoted price in active markets (Level 1) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 6,194 | 9,411 |
Global Equities [Member] | Significant other observable inputs (Level 2) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 5 | 6 |
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 | 588 | 932 |
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 | 20 | 3 |
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 | 568 | 929 |
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 | 22 | 209 |
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 | (53) | 46 |
Enhanced Global Equities [Member] | Significant other observable inputs (Level 2) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 75 | 163 |
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 | 5,771 | 8,495 |
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 | 5,771 | 8,495 |
Private Equity Funds [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 4,068 | 4,490 |
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 | 4,068 | 4,490 |
Governments [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 3,952 | 3,105 |
Governments [Member] | Quoted price in active markets (Level 1) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 2,526 | 1,933 |
Governments [Member] | Significant other observable inputs (Level 2) [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 1,426 | 1,172 |
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 | 12,639 | 18,682 |
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 | 1 | 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 | 12,638 | 18,681 |
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 | 2
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 | 25 |
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 | 25 |
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 | 6,975 | 7,367 |
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 | 6,975 | 7,367 |
Real Estate [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 3,411 | 3,628 |
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 | 1,650 | 1,885 | $ 1,647
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 | 1,761 | 1,743 |
Other Pension Plan Assets [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 3,155 | 5,442 |
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 | 84 | 91 |
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 | 3,071 | 5,351 |
Cash & Cash Equivalents [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 314 | 331 |
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 | 150 | 111 |
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 | 164 | 220 |
Pension Plan Assets Leveled [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | 47,151 | 62,123 |
Other Assets And Liabilities [Member] |  |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |  |
Fair value of plan assets | $ 809 | $ 1,200 |

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