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Reserves for Unpaid Losses and Loss Adjustment Expenses Level 4 Discounted Reserves, P&C (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Weighted Average Discount Rate [Line Items] |  |  |
Current accident year benefit from discounting property and casualty reserves | $ 27 | $ 35 | $ 34
Property, Liability and Casualty Insurance Product Line [Member] |  |  |
Weighted Average Discount Rate [Line Items] |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented | 1,504,000,000 | 1,607,000,000 | 1,577,000,000
Short-duration Insurance Contracts, Discounted Liabilities, Aggregate Discount | 483,000,000 | 523,000,000 | 556,000,000
Short-Duration Contracts, Discounted Liabilities, Amount | 1,021,000,000 | 1,084,000,000 | 1,021,000,000
Accretion of Discounts for Prior Accident Years | $ 29,000,000 | $ 38,000,000 | $ 31,000,000
Weighted Average Discount Rate, Percent |  | 3.24% | 3.50%
Accident and Health Insurance Product Line [Member] |  |  |
Weighted Average Discount Rate [Line Items] |  |  |
Weighted Average Discount Rate, Percent | 3.11% | 3.24% | 3.50%
Minimum [Member] | Property, Liability and Casualty Insurance Product Line [Member] |  |  |
Weighted Average Discount Rate [Line Items] |  |  |
Range of Discount Rates | 1.77% | 1.77% | 1.77%
Maximum [Member] | Property, Liability and Casualty Insurance Product Line [Member] |  |  |
Weighted Average Discount Rate [Line Items] |  |  |
Range of Discount Rates | 14.15% | 14.15% | 14.15%

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- Definition Current accident year benefit from discounting property and casualty reserves. + References No definition available. + Details
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- Definition The carrying amount as of the balance sheet date of loss reserves carried at present value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65670685&loc=d3e14881-158438 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.N.Q1) -URI http://asc.fasb.org/extlink&oid=27015749&loc=d3e569934-122904 + Details
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- Definition Amount of cumulative discount related to the time value of money deducted from short-duration insurance contract liabilities that are reported at present value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65670685&loc=d3e14881-158438 + Details
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- Definition Undiscounted amount, after reinsurance, of the liability for unpaid claims and allocated claim adjustment expense for short-duration insurance contracts for accident years not separately presented in claim development information. Excludes unallocated claim adjustment expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=65670685&loc=SL65671311-158438 + Details
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- Definition The average discount rate applied to insurance contracts to determine future policy benefits to be paid to or on behalf of policyholders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65670685&loc=d3e14881-158438 + Details
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