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Derivative Instruments - Derivatives - Cash Flow Hedges (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months |  |  | $ 24,000,000 |
AOCI Attributable to Parent [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Loss on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring | $ 0 | $ 0 | 0 | $ 0
Cash Flow Hedging | Designated as Hedging Instrument |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Gain (Loss) Recognized in OCI on Derivative (Effective Portion) | 0 | (2,000,000) | (15,000,000) | 8,000,000
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net | 0 | 0 | 0 | 0
Cash Flow Hedging | Designated as Hedging Instrument | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Gain (Loss) Reclassified from AOCI into Income (Effective Portion) | 7,000,000 | 8,000,000 | 25,000,000 | 32,000,000
Cash Flow Hedging | Designated as Hedging Instrument | Interest rate swaps |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Gain (Loss) Recognized in OCI on Derivative (Effective Portion) |  | 2,000,000 | (16,000,000) | 16,000,000
Cash Flow Hedging | Designated as Hedging Instrument | Interest rate swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Net realized capital gains |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Gain (Loss) Reclassified from AOCI into Income (Effective Portion) | 0 | 0 | 1,000,000 | 5,000,000
Cash Flow Hedging | Designated as Hedging Instrument | Interest rate swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Net investment income |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Gain (Loss) Reclassified from AOCI into Income (Effective Portion) | $ 7,000,000 | 8,000,000 | 24,000,000 | 27,000,000
Cash Flow Hedging | Designated as Hedging Instrument | Foreign currency swaps |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Gain (Loss) Recognized in OCI on Derivative (Effective Portion) |  | $ (4,000,000) | $ 1,000,000 | $ (8,000,000)

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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624177-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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- Definition The net gain (loss) recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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- Definition The amount of loss reclassified into earnings in the period when cash flow hedge is discontinued because it is probable that the original forecasted transactions will not occur by the end of the original period or an additional two month time period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994 + Details
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- Definition Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109978405&loc=d3e80720-113993 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 + Details
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