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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
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Dec. 31, 2017 | Dec. 31, 2016
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward] |  |
Balance at beginning of period | $ 365 | $ 366
Less reinsurance recoverables | 184 | 222
Net balance at beginning of period | 181 | 144
Incurred guarantee benefits | 45 | 37
Paid guarantee benefits | (2) | 0
Net change | 43 | 37
Net balance at end of period | 224 | 181
Plus reinsurance recoverables | 146 | 184
Balance at end of period | 370 | 365
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 | 100 | 105
Balance at end of period | 85 | 100
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 | 40 | 65
Balance at end of period | 26 | 40
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 | 34 | 38
Balance at end of period | 22 | 34
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 | 9 | 14
Balance at end of period | 12 | 9
Other Guarantees | Variable annuities |  |
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward] |  |
Balance at beginning of period | 182 | 144
Balance at end of period | 225 | 182
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 | 244 | 223
Less reinsurance recoverables | 101 | 106
Net balance at beginning of period | 143 | 117
Incurred guarantee benefits | 34 | 26
Paid guarantee benefits | (2) | 0
Net change | 32 | 26
Net balance at end of period | 175 | 143
Plus reinsurance recoverables | 87 | 101
Balance at end of period | 262 | 244
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 | 44 | 68
Less reinsurance recoverables | 40 | 64
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 | 25 | 40
Balance at end of period | 29 | 44
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 | 77 | 75
Less reinsurance recoverables | 43 | 52
Net balance at beginning of period | 34 | 23
Incurred guarantee benefits | 11 | 11
Paid guarantee benefits | 0 | 0
Net change | 11 | 11
Net balance at end of period | 45 | 34
Plus reinsurance recoverables | 34 | 43
Balance at end of period | $ 79 | $ 77

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- Definition Amount of increase (decrease) in the liability for guaranteed minimum benefits on long-duration contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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 + 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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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 guaranteed minimum benefit expense incurred for expected guaranteed minimum benefits in excess of projected account values. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 80 -Section 50 -Paragraph 1 -Subparagraph (d)(4) -URI http://asc.fasb.org/extlink&oid=6484115&loc=d3e19393-158473 + Details
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- Definition Amount of cash outflow to policyholders and contract holders for guaranteed minimum benefit payments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 80 -Section 50 -Paragraph 1 -Subparagraph (d)(4) -URI http://asc.fasb.org/extlink&oid=6484115&loc=d3e19393-158473 + Details
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- Definition Amount of guaranteed minimum benefits the ceding insurer expects to recover on insurance policies ceded to other insurance entities as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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 + Details
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