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Fair value measurements Fair Value Measurements (Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Guaranteed Minimum Income Benefit |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Balance - Beginning of year, liabilities | $ 204 |  | $ 559 |  | $ 609 |  |
Balance - End of year, liabilities |  |  | 204 |  | 559 |  |
Guaranteed Benefit Liability, Net | 861 |  | 550 |  | 853 |  | $ 888
Level 3 | Guaranteed Minimum Income Benefit |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Balance - Beginning of year, liabilities | 204 | [1] | 559 | [2] | 609 |  |
Transfers Into Level 3, liabilities | 0 |  | 9 |  | 0 |  |
Transfers out of Level 3, liabilities |  |  |  |  | 0 |  |
Change in Net Unrealized Gains (Losses) included in OCI, Liabilities | 0 |  | 0 |  |  |  |
Net Realized Gains/Losses, Liabilities | 248 |  | (364) |  | (50) |  |
Purchased, liabilities | 0 |  | 0 |  | 0 |  |
Sales, liabilities | 0 |  | 0 |  | 0 |  |
Settlements, liabilities | 0 |  | 0 |  | 0 |  |
Balance - End of year, liabilities | 452 | [3] | 204 | [1] | 559 | [2] |
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Liabilities | 248 |  | (364) |  | (50) |  |
Level 3 | Other derivative instruments |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Balance - Beginning of year, liabilities | 2 |  | 13 |  | 6 |  |
Transfers Into Level 3, liabilities | 0 |  | 0 |  | 0 |  |
Transfers out of Level 3, liabilities |  |  | (9) |  |  |  |
Change in Net Unrealized Gains (Losses) included in OCI, Liabilities | 0 |  | 0 |  | 0 |  |
Net Realized Gains/Losses, Liabilities | (2) |  | (2) |  | 5 |  |
Purchased, liabilities | 0 |  | 0 |  | 2 |  |
Sales, liabilities | 0 |  | 0 |  | 0 |  |
Settlements, liabilities | 0 |  | 0 |  | 0 |  |
Balance - End of year, liabilities | 0 |  | 2 |  | 13 |  |
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Liabilities | $ 0 |  | $ (2) |  | $ 5 |  |
[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 $550 million at December 31, 2017 and $853 million at December 31, 2016, which includes a fair value derivative adjustment of $204 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 $853 million at December 31, 2016 and $888 million at December 31, 2015, which includes a fair value derivative adjustment of $559 million and $609 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. Refer to Note 4 c) for additional information.

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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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- Definition Sum of the amount of expected guaranteed benefits in excess of the projected account balances for minimum guaranteed benefit contracts, as of the balance sheet date, net of reinsurance recoverables, for all guaranteed benefit types. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6588021&loc=d3e7104-158389 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 80 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6484115&loc=d3e19393-158473 + Details
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