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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Guaranteed Minimum Income Benefit |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Balance - Beginning of year, liabilities | $ 452 |  | $ 204 |  | $ 559 |  |
Balance - End of year, liabilities |  |  | 452 |  | 204 |  |
Guaranteed Benefit Liability, Net | 897 |  | 861 |  | 550 |  | $ 853
Level 3 | Guaranteed Minimum Income Benefit |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Balance - Beginning of year, liabilities | 452 | [1] | 204 | [2] | 559 |  |
Transfers Into Level 3, liabilities | 0 |  | 0 |  | 9 |  |
Transfers out of Level 3, liabilities | 0 |  | 0 |  | 0 |  |
Change in Net Unrealized Gains (Losses) included in OCI, Liabilities | 0 |  | 0 |  | 0 |  |
Net Realized Gains/Losses, Liabilities | 4 |  | 248 |  | (364) |  |
Purchased, liabilities | 0 |  | 0 |  | 0 |  |
Sales, liabilities | 0 |  | 0 |  | 0 |  |
Settlements, liabilities | 0 |  | 0 |  | 0 |  |
Balance - End of year, liabilities | 456 | [3] | 452 | [1] | 204 | [2] |
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Liabilities | 4 |  | 248 |  | (364) |  |
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI | 0 |  |  |  |  |  |
Level 3 | Other derivative instruments |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Balance - Beginning of year, liabilities | $ 0 |  | 2 |  | 13 |  |
Transfers Into Level 3, liabilities |  |  | 0 |  | 0 |  |
Transfers out of Level 3, liabilities |  |  | 0 |  | (9) |  |
Change in Net Unrealized Gains (Losses) included in OCI, Liabilities |  |  | 0 |  | 0 |  |
Net Realized Gains/Losses, Liabilities |  |  | (2) |  | (2) |  |
Purchased, liabilities |  |  | 0 |  | 0 |  |
Sales, liabilities |  |  | 0 |  | 0 |  |
Settlements, liabilities |  |  | 0 |  | 0 |  |
Balance - End of year, liabilities |  |  | 0 |  | 2 |  |
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Liabilities |  |  | $ 0 |  | $ (2) |  |
[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 $861 million at December 31, 2018 and $550 million at December 31, 2017, which includes a fair value derivative adjustment of $452 million and $204 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 $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.
[3] | Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits. Refer to Note 5 c) for additional information.

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- Definition Amount of unrealized gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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