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Fair value measurements Fair Value Measurements (Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation) (Details) - Level 3 - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Guaranteed Minimum Income Benefit |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance - Beginning of year, liabilities | $ 897 |  | $ 861 | $ 550
Transfers Into Level 3, liabilities | 0 |  | 0 | 0
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 | 202 |  | 4 | 248
Purchased, liabilities | 0 |  | 0 | 0
Sales, liabilities | 0 |  | 0 | 0
Settlements, liabilities | 0 |  | 0 | 0
Balance - End of year, liabilities | 1,089 | [1] | 897 | 861
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Liabilities | 202 |  | 4 | 248
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI | $ 0 |  | 0 |
Other derivative instruments |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance - Beginning of year, liabilities |  |  | $ 0 | 2
Transfers Into Level 3, liabilities |  |  |  | 0
Transfers out of Level 3, liabilities |  |  |  | 0
Change in Net Unrealized Gains (Losses) included in OCI, Liabilities |  |  |  | 0
Net Realized Gains/Losses, Liabilities |  |  |  | (2)
Purchased, liabilities |  |  |  | 0
Sales, liabilities |  |  |  | 0
Settlements, liabilities |  |  |  | 0
Balance - End of year, liabilities |  |  |  | 0
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Liabilities |  |  |  | $ 0
[1] | Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value.

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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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- Definition Amount of unrealized gain (loss) recognized in other comprehensive income (OCI) 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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- Definition Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy. + 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 (c)(3) -URI http://asc.fasb.org/extlink&oid=117815213&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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&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=117815213&loc=d3e19207-110258 + Details
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