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Summary of Significant Accounting Policies - Securities loaned and Recognition of premium revenues and contract charges, and related benefits and interest credited (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Securities loaned |  |  |
Cash collateral received as percentage of fair value of domestic securities loaned | 102.00% |  |
Cash collateral received as a percent of fair value of foreign securities loaned | 105.00% |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
Valuation allowance for uncollectible premium installment receivables | $ 77 | $ 84 |
Present value of future profits | 47 | 53 |
Amortization expense of present value of future profits | $ 6 | $ 5 | $ 8
Minimum |  |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
Period for amortization of DAC and DSI for interest-sensitive life, fixed annuities and other investment contracts | 15 years |  |
Maximum |  |  |
Securities loaned |  |  |
Securities lending transactions length | 30 days |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
Period for amortization of DAC and DSI for interest-sensitive life, fixed annuities and other investment contracts | 30 years |  |
Personal lines | Minimum |  |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
Property and casualty insurance contract, terms | 6 months |  |
Period for amortization of DAC for property-liability insurance | 6 months |  |
Personal lines | Maximum |  |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
Property and casualty insurance contract, terms | 12 months |  |
Period for amortization of DAC for property-liability insurance | 12 months |  |
Consumer product protection plans | Minimum |  |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
Property and casualty insurance contract, terms | 1 year |  |
Consumer product protection plans | Maximum |  |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
Property and casualty insurance contract, terms | 5 years |  |
Other contracts | Minimum |  |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
Property and casualty insurance contract, terms | 1 year |  |
Other contracts | Maximum |  |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
Property and casualty insurance contract, terms | 5 years |  |
Protection plans and other contracts | Minimum |  |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
Period for amortization of DAC for property-liability insurance | 1 year |  |
Protection plans and other contracts | Maximum |  |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
Period for amortization of DAC for property-liability insurance | 5 years |  |
Interest-sensitive life insurance | Minimum |  |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
Period for amortization of DAC and DSI for interest-sensitive life, fixed annuities and other investment contracts | 10 years |  |
Interest-sensitive life insurance | Maximum |  |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
Period for amortization of DAC and DSI for interest-sensitive life, fixed annuities and other investment contracts | 20 years |  |
Fixed annuities | Minimum |  |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
Period for amortization of DAC and DSI for interest-sensitive life, fixed annuities and other investment contracts | 5 years |  |
Fixed annuities | Maximum |  |  |
Deferred Policy Acquisition and Sales Inducement Costs |  |  |
Period for amortization of DAC and DSI for interest-sensitive life, fixed annuities and other investment contracts | 10 years |  |

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