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Reserve for Life-Contingent Contract Benefits and Contractholder Funds - Variable annuity contracts with guarantees (Details) - Variable annuities - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Variable annuity contracts with guarantees |  |
Account balances of separate accounts with guarantees, invested in equity, fixed income and balanced mutual funds | $ 2,470 | $ 3,020
Account balances of separate accounts with guarantees, invested in money market mutual funds | 245 | 322
In the event of death |  |
Variable annuity contracts with guarantees |  |
Separate account value | 2,711 | 3,344
Net amount at risk | $ 605 | $ 454
Average attained age of contractholders | 71 years | 70 years
At annuitization (includes income benefit guarantees) |  |
Variable annuity contracts with guarantees |  |
Separate account value | $ 778 | $ 944
Net amount at risk | 264 | 202
For cumulative periodic withdrawals |  |
Variable annuity contracts with guarantees |  |
Separate account value | 190 | 253
Net amount at risk | 16 | 10
Accumulation at specified dates |  |
Variable annuity contracts with guarantees |  |
Separate account value | 129 | 170
Net amount at risk | $ 26 | $ 17
Weighted average waiting period until guarantee date | 4 years | 5 years

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- Definition Account balance as of the balance sheet date of the portion of contract holder funds invested in equity, fixed income and balanced mutual funds that are maintained in accounts which are separate from the general account assets of the entity and that meet certain criteria. + References No definition available. + Details
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- Definition Account balance as of the balance sheet date of the portion of contract holder funds invested in money market mutual funds that are maintained in accounts which are separate from the general account assets of the entity and that meet certain criteria. + References No definition available. + Details
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- Definition Net amount at risk, representing the guaranteed benefit in excess of the current account balance corresponding to the specified product, guarantee type and subset of the guarantee. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 80 -Section 50 -Paragraph 1 -Subparagraph (d)(3),(5) -URI http://asc.fasb.org/extlink&oid=6484115&loc=d3e19393-158473 Reference 2: 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 + Details
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- Definition Value of the separate accounts corresponding to the specified product, guarantee type and subset of the guarantee. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 80 -Section 50 -Paragraph 1 -Subparagraph ((d)(1)) -URI http://asc.fasb.org/extlink&oid=6484115&loc=d3e19393-158473 Reference 2: 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 + Details
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- Definition Weighted average attained age of policyholders or contract holders in the specified guarantee type and subset of guarantee class, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 80 -Section 50 -Paragraph 1 -Subparagraph ((d)(5)) -URI http://asc.fasb.org/extlink&oid=6484115&loc=d3e19393-158473 Reference 2: 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 + Details
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