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Fair value measurements Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
Derivative Financial Instruments, Liabilities [Member] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance - Beginning of Period, Liabilities | $ 2 |  | $ 2 |  | $ 2 |  | $ 13 |  |  |  |  |
Transfers into level 3, liability | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |
Transfers out of Level 3, Liabilities | 0 |  | 0 |  | 0 |  | (9) |  |  |  |  |
Change in Net Unrealized Gains (Losses) included in OCI, Liabilities | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |
Net Realized Gains/Losses, Liabilities | 0 |  | 0 |  | 0 |  | (2) |  |  |  |  |
Purchases, Liabilities | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |
Sales, Liabilities | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |
Balance - End of Period, Liabilities | 2 |  | 2 |  | 2 |  | 2 |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |  | (2) |  |  |  |  |
Guaranteed Minimum Income Benefit [Member] |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Reported liabilities | 453 |  | 635 | [1] | 453 |  | 635 | [1] | $ 497 | $ 550 | $ 684 | $ 853
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance - Beginning of Period, Liabilities | 125 |  | 357 |  | 204 |  | 559 |  |  |  |  |
Balance - End of Period, Liabilities | 71 |  | 303 |  | 71 |  | 303 |  |  |  |  |
Guaranteed Minimum Income Benefit [Member] | Guarantees [Member] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance - Beginning of Period, Liabilities |  |  | 357 | [2] | 204 | [3] | 559 | [2] |  |  |  |
Transfers into level 3, liability | 0 |  | 0 |  | 0 |  | 9 |  |  |  |  |
Transfers out of Level 3, Liabilities | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |
Change in Net Unrealized Gains (Losses) included in OCI, Liabilities | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |
Net Realized Gains/Losses, Liabilities | (54) |  | (54) |  | (133) |  | (265) |  |  |  |  |
Purchases, Liabilities | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |
Sales, Liabilities | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |
Balance - End of Period, Liabilities | 71 | [3],[4] | 303 | [1],[2] | 71 | [3],[4] | 303 | [1],[2] |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) | $ (54) |  | $ (54) |  | $ (133) |  | $ (265) |  |  |  |  |
[1] | Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets. The liability for GLB reinsurance was $635 million at September 30, 2017, and $853 million at December 31, 2016, which includes a fair value derivative adjustment of $303 million and $559 million, respectively.
[2] | Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets. The liability for GLB reinsurance was $635 million at September 30, 2017, and $684 million at June 30, 2017, which includes a fair value derivative adjustment of $303 million and $357 million, respectively.
[3] | Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets. The liability for GLB reinsurance was $453 million at September 30, 2018, and $550 million at December 31, 2017, which includes a fair value derivative adjustment of $71 million and $204 million, respectively.
[4] | Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets. The liability for GLB reinsurance was $453 million at September 30, 2018, and $497 million at June 30, 2018, which includes a fair value derivative adjustment of $71 million and $125 million, respectively.

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- Definition Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those liabilities still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as a liability out of level 3 of the fair value hierarchy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of purchases of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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