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Retirement Benefits (Fair Value of Plan Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Benefit Obligation | $ 208 | $ 208 | $ 198
Defined Benefit Plan, Plan Assets, Amount | 291 | 270 | 241
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets |  | 270 |
Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 45 | 43 |
Cash and Cash Equivalents [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 18 | 14 |
Cash and Cash Equivalents [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 1 |  |
Mutual Fund [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 202 | 177 |
Mutual Fund [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 20 | 19 |
Fixed Income Securities [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 71 | 79 |
Fixed Income Securities [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 24 | 23 |
Cash and Cash Equivalents [Domain] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 1 |
Level 1 [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 220 | 191 |
Level 1 [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 21 | 20 |
Level 1 [Member] | Cash and Cash Equivalents [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 18 | 14 |
Level 1 [Member] | Cash and Cash Equivalents [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 1 |  |
Level 1 [Member] | Mutual Fund [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 202 | 177 |
Level 1 [Member] | Mutual Fund [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 20 | 19 |
Level 1 [Member] | Fixed Income Securities [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Level 1 [Member] | Fixed Income Securities [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Level 1 [Member] | Cash and Cash Equivalents [Domain] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 1 |
Level 2 [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 71 | 79 |
Level 2 [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 24 | 23 |
Level 2 [Member] | Cash and Cash Equivalents [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Level 2 [Member] | Cash and Cash Equivalents [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 |  |
Level 2 [Member] | Mutual Fund [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Level 2 [Member] | Mutual Fund [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Level 2 [Member] | Fixed Income Securities [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 71 | 79 |
Level 2 [Member] | Fixed Income Securities [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 24 | 23 |
Level 2 [Member] | Cash and Cash Equivalents [Domain] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 |
Level 3 [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Level 3 [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Level 3 [Member] | Cash and Cash Equivalents [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Level 3 [Member] | Cash and Cash Equivalents [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 |  |
Level 3 [Member] | Mutual Fund [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Level 3 [Member] | Mutual Fund [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Level 3 [Member] | Fixed Income Securities [Member] | Other Postretirement Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Level 3 [Member] | Fixed Income Securities [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Level 3 [Member] | Cash and Cash Equivalents [Domain] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 |
Funded Plans [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation | 55 | 51 |
Defined Benefit Plan, Benefit Obligation | 55 | 52 | 1
Defined Benefit Plan, Plan Assets, Amount | 45 | 43 | 1
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets |  | 43 |
Unfunded Plans [Member] | Pension Benefits |  |  |
Fair Value of Plan Assets [Line Items] |  |  |
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation | 31 | 34 |
Defined Benefit Plan, Benefit Obligation | 31 | 34 | 37
Defined Benefit Plan, Plan Assets, Amount | $ 0 | 0 | $ 0
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets |  | $ 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 http://asc.fasb.org/extlink&oid=118255775&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 http://asc.fasb.org/extlink&oid=118255775&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 http://asc.fasb.org/extlink&oid=118255775&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 http://asc.fasb.org/extlink&oid=118255775&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 http://asc.fasb.org/extlink&oid=118257860&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 http://asc.fasb.org/extlink&oid=118255775&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 http://asc.fasb.org/extlink&oid=118255775&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 http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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