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Fair Value Measurements Level 4 Fair Value Option (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets, Fair Value Disclosure |  | $ 181,633 | $ 199,248
Fair Value, Option, Changes in Fair Value, Gain (Loss) |  | (16) | 11
Equity Securities [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets, Fair Value Disclosure | [1] | 282 | 348
Fixed Maturities [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets, Fair Value Disclosure |  | 503 | 488
Equity Securities [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) |  | (12) | (3)
Asset-backed Securities [Member] | Fixed Maturities [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets, Fair Value Disclosure |  | 13 | 15
Corporate Debt Securities [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) |  | (7) | (3)
Corporate Debt Securities [Member] | Fixed Maturities [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets, Fair Value Disclosure |  | 87 | 133
Collateralized Debt Obligations [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) |  | 1 | 18
Collateralized Debt Obligations [Member] | Fixed Maturities [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets, Fair Value Disclosure |  | 6 | 69
Commercial Mortgage Backed Securities [Member] | Fixed Maturities [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets, Fair Value Disclosure |  | 24 | 22
Foreign Government Debt Securities [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) |  | 2 | 0
Foreign Government Debt Securities [Member] | Fixed Maturities [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets, Fair Value Disclosure |  | 2 | 30
Residential Mortgage Backed Securities [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) |  | 0 | (1)
Residential Mortgage Backed Securities [Member] | Fixed Maturities [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets, Fair Value Disclosure |  | 368 | 215
US Treasury Bond Securities [Member] | Fixed Maturities [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets, Fair Value Disclosure |  | 3 | 2
Municipal Bonds [Member] | Fixed Maturities [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets, Fair Value Disclosure |  | 0 | 2
Fixed Maturities [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) |  | $ (4) | $ 14
[1] | [1] Included in equity securities, AFS on the Consolidated Balance Sheets.

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