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Fair Value Measurements (Details 2) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
US Treasury and Government [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Financial assets, Beginning Balance | $ 15 | $ 20
Total realized/unrealized gains (losses) included in Net income | 0 | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0
Purchases and issuances | 0 | 0
Sales and settlements | 0 | 0
Transfer into Level 3 | 0 | 0
Transfer out of Level 3 | 0 | 0
Financial assets, Ending Balance | 15 | 20
States, municipalities and political subdivisions [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Financial assets, Beginning Balance | 61 | 58
Total realized/unrealized gains (losses) included in Net income | 0 | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0
Purchases and issuances | 0 | 0
Sales and settlements | 0 | 0
Transfer into Level 3 | 0 | 0
Transfer out of Level 3 | 0 | (4)
Financial assets, Ending Balance | 61 | 54
Residential Mortgage Backed Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Financial assets, Beginning Balance | 316 | 371
Total realized/unrealized gains (losses) included in Net income | 1 | 2
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 4 | 6
Purchases and issuances | 0 | 6
Sales and settlements | (8) | (12)
Transfer into Level 3 | 32 | 16
Transfer out of Level 3 | (73) | (35)
Financial assets, Ending Balance | 272 | 354
Commercial Mortgage Backed Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Financial assets, Beginning Balance | 28 | 22
Total realized/unrealized gains (losses) included in Net income | 0 | 1
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0
Purchases and issuances | 0 | 0
Sales and settlements | 0 | 0
Transfer into Level 3 | 0 | 7
Transfer out of Level 3 | 0 | 0
Financial assets, Ending Balance | 28 | 30
Asset-backed Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Financial assets, Beginning Balance | 75 | 253
Total realized/unrealized gains (losses) included in Net income | 0 | 1
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 1 | 0
Purchases and issuances | 50 | 12
Sales and settlements | (1) | (6)
Transfer into Level 3 | 81 | 0
Transfer out of Level 3 | 0 | (15)
Financial assets, Ending Balance | 206 | 245
All other corporate [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Financial assets, Beginning Balance | 335 | 236
Total realized/unrealized gains (losses) included in Net income | 1 | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 3 | 0
Purchases and issuances | 1 | 10
Sales and settlements | (16) | (2)
Transfer into Level 3 | 0 | 0
Transfer out of Level 3 | (2) | 0
Financial assets, Ending Balance | 322 | 244
Equity securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Financial assets, Beginning Balance | 31 | 37
Total realized/unrealized gains (losses) included in Net income | 1 | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 2 | 3
Purchases and issuances | 30 | 9
Sales and settlements | (9) | 0
Transfer into Level 3 | 0 | 0
Transfer out of Level 3 | (14) | 0
Financial assets, Ending Balance | 41 | 49
Assets of Managed Investment Entities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Financial assets, Beginning Balance | 30 | 40
Total realized/unrealized gains (losses) included in Net income | (1) | (4)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0
Purchases and issuances | 0 | 0
Sales and settlements | 0 | 0
Transfer into Level 3 | 0 | 0
Transfer out of Level 3 | 0 | (6)
Financial assets, Ending Balance | $ 29 | $ 30

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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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