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Retirement Benefits (Fair Value of Plan Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Accumulated benefit obligation | $ 148 | $ 195 | $ 208
Fair value of plan assets | 259 | 311 | 291
Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Accumulated benefit obligation |  | 50 | 55
Fair value of plan assets | 20 | 44 |
Cash and Cash Equivalents [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets | 19 | 22 |
Cash and Cash Equivalents [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets | 2 | 1 |
Mutual Fund [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets | 146 | 175 |
Mutual Fund [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets | 18 | 24 |
Fixed Income Securities [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets | 94 | 114 |
Fixed Income Securities [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets |  | 19 |
Level 1 [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets | 165 | 197 |
Level 1 [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets | 20 | 25 |
Level 1 [Member] | Cash and Cash Equivalents [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets | 19 | 22 |
Level 1 [Member] | Cash and Cash Equivalents [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets | 2 | 1 |
Level 1 [Member] | Mutual Fund [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets | 146 | 175 |
Level 1 [Member] | Mutual Fund [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets | 18 | 24 |
Level 1 [Member] | Fixed Income Securities [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 1 [Member] | Fixed Income Securities [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets |  | 0 |
Level 2 [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets | 94 | 114 |
Level 2 [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets | 0 | 19 |
Level 2 [Member] | Cash and Cash Equivalents [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 2 [Member] | Cash and Cash Equivalents [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 2 [Member] | Mutual Fund [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 2 [Member] | Mutual Fund [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 2 [Member] | Fixed Income Securities [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets | 94 | 114 |
Level 2 [Member] | Fixed Income Securities [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets |  | 19 |
Level 3 [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 3 [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 3 [Member] | Cash and Cash Equivalents [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 3 [Member] | Cash and Cash Equivalents [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 3 [Member] | Mutual Fund [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 3 [Member] | Mutual Fund [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 3 [Member] | Fixed Income Securities [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 3 [Member] | Fixed Income Securities [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Fair value of plan assets |  | 0 |
Funded Plans [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Projected benefit obligation | 22 | 50 |
Accumulated benefit obligation | 22 | 50 |
Fair value of plan assets | 20 | 44 | 45
Unfunded Plans [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Projected benefit obligation | 19 | 26 |
Accumulated benefit obligation | 19 | 26 | 31
Fair value of plan assets | $ 0 | $ 0 | $ 0

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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + 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 (a) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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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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