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Pension and Other Postretirement Employee Benefit Plans (Fair Values of Pension Plan Assets) (Details) - Pension benefit plans - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | $ 2,726 | $ 3,663
Quoted Prices in Active Market (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 648 | 796
Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 574 | 698
Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 0 | 0
Fair Value, Inputs, Level 1, 2 and 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 1,222 | 1,494
Cash and cash equivalents | Quoted Prices in Active Market (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 113 | 85
Cash and cash equivalents | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 0 | 0
Cash and cash equivalents | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 0 | 0
Cash and cash equivalents | Fair Value, Inputs, Level 1, 2 and 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 113 | 85
Common stock | Quoted Prices in Active Market (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 379 | 486
Common stock | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 0 | 0
Common stock | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 0 | 0
Common stock | Fair Value, Inputs, Level 1, 2 and 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 379 | 486
Preferred stock | Quoted Prices in Active Market (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 0 | 2
Preferred stock | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 0 | 0
Preferred stock | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 0 | 0
Preferred stock | Fair Value, Inputs, Level 1, 2 and 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 0 | 2
Corporate bonds | Quoted Prices in Active Market (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 0 | 0
Corporate bonds | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 129 | 47
Corporate bonds | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 0 | 0
Corporate bonds | Fair Value, Inputs, Level 1, 2 and 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 129 | 47
Government issued | Quoted Prices in Active Market (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 0 | 0
Government issued | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 24 | 46
Government issued | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 0 | 0
Government issued | Fair Value, Inputs, Level 1, 2 and 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 24 | 46
Mutual funds | Quoted Prices in Active Market (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 156 | 223
Mutual funds | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 118 | 248
Mutual funds | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 0 | 0
Mutual funds | Fair Value, Inputs, Level 1, 2 and 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 274 | 471
Insurance contracts | Quoted Prices in Active Market (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 0 | 0
Insurance contracts | Significant Other Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 303 | 357
Insurance contracts | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 0 | 0
Insurance contracts | Fair Value, Inputs, Level 1, 2 and 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 303 | 357
Common/collective trusts | Fair Value Measured at Net Asset Value Per Share |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | 811 | 1,073
Venture capital, partnerships and other private investments | Fair Value Measured at Net Asset Value Per Share |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, amount | $ 693 | $ 1,096

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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