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Reserve for Life-Contingent Contract Benefits and Contractholder Funds - Summary of liabilities for guarantees (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward] |  |
Balance at beginning of period | $ 419 | $ 444
Less reinsurance recoverables | 133 | 185
Net balance at beginning of period | 286 | 259
Incurred guarantee benefits | 68 | 30
Paid guarantee benefits | (2) | (3)
Net change | 66 | 27
Net balance at end of period | 352 | 286
Plus reinsurance recoverables | 125 | 133
Balance at end of period | 477 | 419
Variable annuities |  |
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward] |  |
Balance at beginning of period | 419 | 444
Balance at end of period | 477 | 419
Death benefits | Variable annuities |  |
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward] |  |
Balance at beginning of period | 78 | 109
Balance at end of period | 67 | 78
At annuitization (includes income benefit guarantees) | Variable annuities |  |
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward] |  |
Balance at beginning of period | 21 | 36
Balance at end of period | 24 | 21
Accumulation at specified dates | Variable annuities |  |
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward] |  |
Balance at beginning of period | 18 | 25
Balance at end of period | 18 | 18
Withdrawal benefits | Variable annuities |  |
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward] |  |
Balance at beginning of period | 14 | 14
Balance at end of period | 15 | 14
Other guarantees | Variable annuities |  |
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward] |  |
Balance at beginning of period | 288 | 260
Balance at end of period | 353 | 288
Liability for guarantees related to death benefits and interest-sensitive life products |  |
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward] |  |
Balance at beginning of period | 293 | 308
Less reinsurance recoverables | 81 | 111
Net balance at beginning of period | 212 | 197
Incurred guarantee benefits | 50 | 18
Paid guarantee benefits | (2) | (3)
Net change | 48 | 15
Net balance at end of period | 260 | 212
Plus reinsurance recoverables | 69 | 81
Balance at end of period | 329 | 293
At annuitization (includes income benefit guarantees) |  |
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward] |  |
Balance at beginning of period | 24 | 39
Less reinsurance recoverables | 20 | 35
Net balance at beginning of period | 4 | 4
Incurred guarantee benefits | 0 | 0
Paid guarantee benefits | 0 | 0
Net change | 0 | 0
Net balance at end of period | 4 | 4
Plus reinsurance recoverables | 23 | 20
Balance at end of period | 27 | 24
Liability for guarantees related to accumulation and withdrawal benefits |  |
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward] |  |
Balance at beginning of period | 102 | 97
Less reinsurance recoverables | 32 | 39
Net balance at beginning of period | 70 | 58
Incurred guarantee benefits | 18 | 12
Paid guarantee benefits | 0 | 0
Net change | 18 | 12
Net balance at end of period | 88 | 70
Plus reinsurance recoverables | 33 | 32
Balance at end of period | $ 121 | $ 102

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- Definition Amount of increase (decrease) in the liability for guaranteed minimum benefits on long-duration contracts. + 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) -URI http://asc.fasb.org/extlink&oid=121641442&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=121639652&loc=d3e7104-158389 + Details
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- Definition Amount of expected guaranteed benefits in excess of the projected account balances for minimum guaranteed benefit contracts, as of the balance sheet date. + 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=121639652&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 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=121641442&loc=d3e19393-158473 + Details
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- Definition Amount of expected guaranteed benefits in excess of the projected account balances for minimum guaranteed benefit contracts, net of reinsurance recoverables, as of the balance sheet date. + 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) -URI http://asc.fasb.org/extlink&oid=121641442&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=121639652&loc=d3e7104-158389 + Details
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