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Reserve for Life-Contingent Contract Benefits and Contractholder Funds - Key assumptions (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Key contract provisions relating to contractholder funds: |  |  |  |
Total contractholder funds | $ 19,434 | $ 20,260 | $ 21,295 | $ 22,529
Interest-sensitive life insurance |  |  |  |
Key contract provisions relating to contractholder funds: |  |  |  |
Period for withdrawal or surrender charges | 20 years |  |  |
Total contractholder funds | $ 8,190 | 8,062 |  |
Equity-indexed life insurance | Minimum |  |  |  |
Key contract provisions relating to contractholder funds: |  |  |  |
Contractholder funds, interest rate assumptions (as a percent) | 0.00% |  |  |
Equity-indexed life insurance | Maximum |  |  |  |
Key contract provisions relating to contractholder funds: |  |  |  |
Contractholder funds, interest rate assumptions (as a percent) | 10.50% |  |  |
Other life insurance | Minimum |  |  |  |
Key contract provisions relating to contractholder funds: |  |  |  |
Contractholder funds, interest rate assumptions (as a percent) | 1.00% |  |  |
Other life insurance | Maximum |  |  |  |
Key contract provisions relating to contractholder funds: |  |  |  |
Contractholder funds, interest rate assumptions (as a percent) | 6.00% |  |  |
Fixed annuities |  |  |  |
Key contract provisions relating to contractholder funds: |  |  |  |
Percent of fixed annuities subject to market value adjustment for discretionary withdrawals | 16.70% |  |  |
Total contractholder funds | $ 10,828 | 11,933 |  |
Immediate Fixed Annuities | Minimum |  |  |  |
Key contract provisions relating to contractholder funds: |  |  |  |
Contractholder funds, interest rate assumptions (as a percent) | 0.00% |  |  |
Immediate Fixed Annuities | Maximum |  |  |  |
Key contract provisions relating to contractholder funds: |  |  |  |
Contractholder funds, interest rate assumptions (as a percent) | 9.80% |  |  |
Equity-indexed fixed annuities | Minimum |  |  |  |
Key contract provisions relating to contractholder funds: |  |  |  |
Contractholder funds, interest rate assumptions (as a percent) | (8.00%) |  |  |
Equity-indexed fixed annuities | Maximum |  |  |  |
Key contract provisions relating to contractholder funds: |  |  |  |
Contractholder funds, interest rate assumptions (as a percent) | 12.30% |  |  |
Other fixed annuities | Minimum |  |  |  |
Key contract provisions relating to contractholder funds: |  |  |  |
Contractholder funds, interest rate assumptions (as a percent) | 0.10% |  |  |
Other fixed annuities | Maximum |  |  |  |
Key contract provisions relating to contractholder funds: |  |  |  |
Contractholder funds, interest rate assumptions (as a percent) | 6.00% |  |  |
Other investment contracts |  |  |  |
Key contract provisions relating to contractholder funds: |  |  |  |
Total contractholder funds | $ 416 | $ 265 |  |
Other investment contracts | Minimum |  |  |  |
Key contract provisions relating to contractholder funds: |  |  |  |
Contractholder funds, interest rate assumptions (as a percent) | 1.50% |  |  |
Other investment contracts | Maximum |  |  |  |
Key contract provisions relating to contractholder funds: |  |  |  |
Contractholder funds, interest rate assumptions (as a percent) | 10.30% |  |  |

X
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- Definition Interest rate applied to policyholder contract deposits during the stated period. + References No definition available. + Details
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- Definition The period over which withdrawal or surrender charges are generally calculated as either a percentage of account or declining dollar amount. + References No definition available. + Details
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- Definition The liability as of the balance sheet date to the policyholders for deposits held under the terms of insurance contracts. + References Reference 1: 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)(3)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 30 -Paragraph 16 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49168914&loc=d3e13951-158433 + Details
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