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Reserve for Life-Contingent Contract Benefits and Contractholder Funds - Reserve for life-contingent contract benefits (Details) - USD ($) | 12 Months Ended |
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Dec. 31, 2017 | Dec. 31, 2016
Reserve for life-contingent benefits: |  |
Total reserve for life-contingent contract benefits | $ 12,549,000,000 | $ 12,239,000,000
Key assumptions generally used in calculating the reserve for life-contingent contract benefits: |  |
Premium deficiency reserve | (315,000,000) | 0
Unrealized net capital gains and losses | 249,000,000 |
Structured settlement annuities |  |
Reserve for life-contingent benefits: |  |
Total reserve for life-contingent contract benefits | $ 6,994,000,000 | 6,681,000,000
Structured settlement annuities | Minimum |  |
Key assumptions generally used in calculating the reserve for life-contingent contract benefits: |  |
Life contingent contract benefits, interest rate assumptions (as a percent) | 2.90% |
Structured settlement annuities | Maximum |  |
Key assumptions generally used in calculating the reserve for life-contingent contract benefits: |  |
Life contingent contract benefits, interest rate assumptions (as a percent) | 9.00% |
Other immediate fixed annuities |  |
Reserve for life-contingent benefits: |  |
Total reserve for life-contingent contract benefits | $ 1,855,000,000 | 1,941,000,000
Other immediate fixed annuities | Minimum |  |
Key assumptions generally used in calculating the reserve for life-contingent contract benefits: |  |
Life contingent contract benefits, interest rate assumptions (as a percent) | 0.00% |
Other immediate fixed annuities | Maximum |  |
Key assumptions generally used in calculating the reserve for life-contingent contract benefits: |  |
Life contingent contract benefits, interest rate assumptions (as a percent) | 11.50% |
Traditional life insurance |  |
Reserve for life-contingent benefits: |  |
Total reserve for life-contingent contract benefits | $ 2,722,000,000 | 2,643,000,000
Key assumptions generally used in calculating the reserve for life-contingent contract benefits: |  |
Premium deficiency reserve | $ 315,000,000 |
Traditional life insurance | Minimum |  |
Key assumptions generally used in calculating the reserve for life-contingent contract benefits: |  |
Life contingent contract benefits, interest rate assumptions (as a percent) | 2.50% |
Traditional life insurance | Maximum |  |
Key assumptions generally used in calculating the reserve for life-contingent contract benefits: |  |
Life contingent contract benefits, interest rate assumptions (as a percent) | 11.30% |
Accident and health insurance |  |
Reserve for life-contingent benefits: |  |
Total reserve for life-contingent contract benefits | $ 893,000,000 | 873,000,000
Accident and health insurance | Minimum |  |
Key assumptions generally used in calculating the reserve for life-contingent contract benefits: |  |
Life contingent contract benefits, interest rate assumptions (as a percent) | 3.00% |
Accident and health insurance | Maximum |  |
Key assumptions generally used in calculating the reserve for life-contingent contract benefits: |  |
Life contingent contract benefits, interest rate assumptions (as a percent) | 7.00% |
Other |  |
Reserve for life-contingent benefits: |  |
Total reserve for life-contingent contract benefits | $ 85,000,000 | $ 101,000,000
Other | Minimum |  |
Key assumptions generally used in calculating the reserve for life-contingent contract benefits: |  |
Life contingent contract benefits, interest rate assumptions (as a percent) | 2.00% |
Other | Maximum |  |
Key assumptions generally used in calculating the reserve for life-contingent contract benefits: |  |
Life contingent contract benefits, interest rate assumptions (as a percent) | 5.80% |

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- Definition Increase (Decrease) in Amounts Recognized in Unrealized Net Capital Gains, Accumulated Other Comprehensive Income + References No definition available. + Details
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- Definition Insurance reserve adjustment included in accumulated other comprehensive income (loss) which represents the amount by which the reserve balance would increase if the net unrealized gains in the applicable product portfolios were realized and reinvested at current lower interest rates, resulting in a premium deficiency. + References No definition available. + Details
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- Definition Interest rate in the range of interest rates used to calculate future benefits to be paid to or on behalf of policyholders and related expenses less the present value of future net premiums using assumptions such as estimates of expected investment yields, mortality, morbidity, terminations and expenses, applicable at the time the insurance contracts are made and cost of settling insured claims and cost incurred in the claim settlement process. + References No definition available. + Details
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- Definition Amount of accrued obligation to policyholders that relates to insured events for long-duration contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 25 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28366191&loc=d3e13145-158430 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.13(a)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 + Details
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