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Retirement Benefits (Obligations and Funded Status) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Change in benefit obligation: |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement | $ 0 | $ 0
Change in plan assets: |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement | 0 | 0
Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Service Cost | 0 | 0
Change in benefit obligation: |  |
Defined Benefit Plan, Interest Cost | 1 | 2
Amounts recognized in the consolidated balance sheets consist of: |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position |  | 0
Amounts recognized in accumulated other comprehensive loss (pre-tax basis) consist of: |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax |  | 0
Other Postretirement Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Service Cost | 1 | 0
Change in benefit obligation: |  |
Defined Benefit Plan, Benefit Obligation | 156 | 166
Defined Benefit Plan, Interest Cost | 5 | 4
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment | 60 | 7
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31) | (17) | (20)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | (7) | (1)
Defined Benefit Plan, Benefit Obligation | 198 | 156
Change in plan assets: |  |
Defined Benefit Plan, Plan Assets, Amount | 257 | 256
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) | (8) | 11
Defined Benefit Plan, Plan Assets, Contributions by Employer | 9 | 10
Defined Benefit Plan, Plan Assets, Amount | 241 | 257
Defined Benefit Plan, Funded (Unfunded) Status of Plan | (43) | (101)
Amounts recognized in the consolidated balance sheets consist of: |  |
Assets for Plan Benefits, Defined Benefit Plan | 68 | 127
Liability, Defined Benefit Plan, Current | (2) | (2)
Liability, Defined Benefit Plan, Noncurrent | (23) | (24)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position | 43 | 101
Amounts recognized in accumulated other comprehensive loss (pre-tax basis) consist of: |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax | (7) | (18)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax | 66 | 21
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | 59 | 3
Defined Benefit Plan, Plan Assets, Benefits Paid | 17 | 20
Funded Plans [Member] |  |
Change in benefit obligation: |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement | 0 |
Change in plan assets: |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement | 0 |
Funded Plans [Member] | Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Service Cost | 0 |
Change in benefit obligation: |  |
Defined Benefit Plan, Benefit Obligation | 1 | 18
Defined Benefit Plan, Interest Cost | 0 | 1
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment | 0 | 0
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31) | 0 | (2)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | 0 | 2
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement |  | (18)
Defined Benefit Plan, Benefit Obligation | 1 | 1
Change in plan assets: |  |
Defined Benefit Plan, Plan Assets, Amount | 1 | 12
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) | 0 | 3
Defined Benefit Plan, Plan Assets, Contributions by Employer | 0 | 6
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement |  | (18)
Defined Benefit Plan, Plan Assets, Amount | 1 | 1
Defined Benefit Plan, Funded (Unfunded) Status of Plan | 0 | 0
Amounts recognized in the consolidated balance sheets consist of: |  |
Assets for Plan Benefits, Defined Benefit Plan | 0 | 0
Liability, Defined Benefit Plan, Current | 0 | 0
Liability, Defined Benefit Plan, Noncurrent | 0 | 0
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position | 0 |
Amounts recognized in accumulated other comprehensive loss (pre-tax basis) consist of: |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax | 0 | 0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax | 0 | 0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | 0 |
Defined Benefit Plan, Plan Assets, Benefits Paid | 0 | 2
Unfunded Plans [Member] |  |
Change in benefit obligation: |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement | 0 | 0
Change in plan assets: |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement | 0 | 0
Unfunded Plans [Member] | Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Service Cost | 0 | 0
Change in benefit obligation: |  |
Defined Benefit Plan, Benefit Obligation | 47 | 51
Defined Benefit Plan, Interest Cost | 1 | 1
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment | 0 | 0
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31) | (7) | (6)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | (4) | 1
Defined Benefit Plan, Benefit Obligation | 37 | 47
Change in plan assets: |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) | 0 | 0
Defined Benefit Plan, Plan Assets, Contributions by Employer | 0 | 0
Defined Benefit Plan, Plan Assets, Amount | 0 | 0
Defined Benefit Plan, Funded (Unfunded) Status of Plan | 37 | 47
Amounts recognized in the consolidated balance sheets consist of: |  |
Assets for Plan Benefits, Defined Benefit Plan | 0 | 0
Liability, Defined Benefit Plan, Current | (6) | (8)
Liability, Defined Benefit Plan, Noncurrent | (31) | (39)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position | (37) | (47)
Amounts recognized in accumulated other comprehensive loss (pre-tax basis) consist of: |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax | 1 | 5
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax | 0 | 0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | 1 | 5
Defined Benefit Plan, Plan Assets, Benefits Paid | $ 0 | $ 0

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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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 (b)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: 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=112275985&loc=d3e4179-114921 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109237824&loc=d3e1731-114919 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109237824&loc=d3e1703-114919 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(10)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + 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=108410482&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=108410482&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=108410482&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=112275985&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 (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 6: 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=108410482&loc=d3e1928-114920 + Details
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