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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, 2018 | Dec. 31, 2017
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward] |  |
Balance at beginning of period | $ 370 | $ 365
Less reinsurance recoverables | 146 | 184
Net balance at beginning of period | 224 | 181
Incurred guarantee benefits | 37 | 45
Paid guarantee benefits | (2) | (2)
Net change | 35 | 43
Net balance at end of period | 259 | 224
Plus reinsurance recoverables | 185 | 146
Balance at end of period | 444 | 370
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 | 85 | 100
Balance at end of period | 109 | 85
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 | 26 | 40
Balance at end of period | 36 | 26
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 | 22 | 34
Balance at end of period | 25 | 22
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 | 12 | 9
Balance at end of period | 14 | 12
Other Guarantees | Variable annuities |  |
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward] |  |
Balance at beginning of period | 225 | 182
Balance at end of period | 260 | 225
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 | 262 | 244
Less reinsurance recoverables | 87 | 101
Net balance at beginning of period | 175 | 143
Incurred guarantee benefits | 24 | 34
Paid guarantee benefits | (2) | (2)
Net change | 22 | 32
Net balance at end of period | 197 | 175
Plus reinsurance recoverables | 111 | 87
Balance at end of period | 308 | 262
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 | 29 | 44
Less reinsurance recoverables | 25 | 40
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 | 35 | 25
Balance at end of period | 39 | 29
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 | 79 | 77
Less reinsurance recoverables | 34 | 43
Net balance at beginning of period | 45 | 34
Incurred guarantee benefits | 13 | 11
Paid guarantee benefits | 0 | 0
Net change | 13 | 11
Net balance at end of period | 58 | 45
Plus reinsurance recoverables | 39 | 34
Balance at end of period | $ 97 | $ 79

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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=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 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=6588021&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=6484115&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=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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