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Fair Value Measurements Level 4 Fair Value Option (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets, Fair Value Disclosure | $ 172,243 | $ 181,633 |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | (27) | (16) | $ 11
Equity Securities [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets, Fair Value Disclosure | 0 | 282 |
Fixed Maturities [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets, Fair Value Disclosure |  | 503 |
Equity Securities [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | (34) | (12) | (3)
Asset-backed Securities [Member] | Fixed Maturities [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets, Fair Value Disclosure | 7 | 13 |
Corporate Debt Securities [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | 0 | (7) | (3)
Corporate Debt Securities [Member] | Fixed Maturities [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets, Fair Value Disclosure | 40 | 87 |
Collateralized Debt Obligations [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | 0 | 1 | 18
Collateralized Debt Obligations [Member] | Fixed Maturities [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets, Fair Value Disclosure | 3 | 6 |
Commercial Mortgage Backed Securities [Member] | Fixed Maturities [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets, Fair Value Disclosure | 8 | 24 |
Foreign Government Debt Securities [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | (1) | 2 | 0
Foreign Government Debt Securities [Member] | Fixed Maturities [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets, Fair Value Disclosure | 0 | 2 |
Residential Mortgage Backed Securities [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | 8 | 0 | (1)
Residential Mortgage Backed Securities [Member] | Fixed Maturities [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets, Fair Value Disclosure | 228 | 368 |
US Treasury Bond Securities [Member] | Fixed Maturities [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets, Fair Value Disclosure | 7 | 3 |
Fixed Maturities [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | $ 7 | $ (4) | $ 14

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- Definition For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 + Details
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