Investments (Fair Value of Trading Securities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading Securities	$ 2,282	$ 2,554
Equity securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading Securities		2
Fixed maturity securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading Securities	2,282	2,552
Fixed maturity securities [Member] \| Corporate bonds [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading Securities	1,771	1,929
Fixed maturity securities [Member] \| U.S. government bonds [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading Securities	272	310
Fixed maturity securities [Member] \| Foreign government bonds [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading Securities	24	31
Fixed maturity securities [Member] \| RMBS [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading Securities	155	192
Fixed maturity securities [Member] \| CMBS [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading Securities	7	17
Fixed maturity securities [Member] \| CLOs [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading Securities	2	4
Fixed maturity securities [Member] \| State, municipalities and political subdivisions [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading Securities	21	27
Fixed maturity securities [Member] \| Hybrid and redeemable preferred securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading Securities	$ 30	$ 42

The total of financial instruments that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for debt and equity securities formerly categorized as available-for-sale or held-to-maturity which the entity held as of the date it opted to account for such securities at fair value. An enterprise may also categorize such a security as trading without the intent to sell it in the near term assuming the decision to categorize the security as trading occurred at acquisition.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 13

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 159

-Paragraph 29

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 12

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Implementation Guide (Q and A)

-Number FAS115

-Paragraph 35

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.4)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789

+ Details