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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, 2019 | Dec. 31, 2018
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward] |  |
Balance at beginning of period | $ 444 | $ 370
Less reinsurance recoverables | 185 | 146
Net balance at beginning of period | 259 | 224
Incurred guarantee benefits | 30 | 37
Paid guarantee benefits | (3) | (2)
Net change | 27 | 35
Net balance at end of period | 286 | 259
Plus reinsurance recoverables | 133 | 185
Balance at end of period | 419 | 444
In the event of death | Variable annuities |  |
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward] |  |
Balance at beginning of period | 109 | 85
Balance at end of period | 78 | 109
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 | 36 | 26
Balance at end of period | 21 | 36
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 | 25 | 22
Balance at end of period | 18 | 25
For cumulative periodic withdrawals | Variable annuities |  |
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward] |  |
Balance at beginning of period | 14 | 12
Balance at end of period | 14 | 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 | 260 | 225
Balance at end of period | 288 | 260
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 | 308 | 262
Less reinsurance recoverables | 111 | 87
Net balance at beginning of period | 197 | 175
Incurred guarantee benefits | 18 | 24
Paid guarantee benefits | (3) | (2)
Net change | 15 | 22
Net balance at end of period | 212 | 197
Plus reinsurance recoverables | 81 | 111
Balance at end of period | 293 | 308
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 | 39 | 29
Less reinsurance recoverables | 35 | 25
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 | 20 | 35
Balance at end of period | 24 | 39
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 | 97 | 79
Less reinsurance recoverables | 39 | 34
Net balance at beginning of period | 58 | 45
Incurred guarantee benefits | 12 | 13
Paid guarantee benefits | 0 | 0
Net change | 12 | 13
Net balance at end of period | 70 | 58
Plus reinsurance recoverables | 32 | 39
Balance at end of period | $ 102 | $ 97

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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=117420044&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=117418410&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=117418410&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=117420044&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=117420044&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=117418410&loc=d3e7104-158389 + Details
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