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Investments (Gross Unrealized Losses Related To AFS And HTM Investments) (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
AFS Investments, Total, Fair Value | $ 880 |
AFS Investments, Total, Unrealized Losses | (139) |
Mortgage-Backed Securities [Member] |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
AFS Investments, Total, Fair Value | 355 |
AFS Investments, Total, Unrealized Losses | (23) |
Asset-Backed Securities [Member] |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
AFS Investments, Total, Fair Value | 235 |
AFS Investments, Total, Unrealized Losses | (90) |
HTM Investments [Member] |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
HTM Investments, Less than 12 Months, Fair Value | 297 | 284
HTM Investments, Less than 12 Months, Unrealized Losses | (19) | (31)
HTM Investments, 12 Months or Longer, Fair Value | 1,287 | 2,185
HTM Investments, 12 Months or Longer, Unrealized Losses | (138) | (340)
HTM Investments, Total, Fair Value | 1,584 | 2,469
HTM Investments, Total, Unrealized Losses | (157) | (371)
HTM Investments [Member] | Variable Interest Entity [Member] | Corporate Obligations [Member] |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
HTM Investments, Less than 12 Months, Fair Value | 297 | 284
HTM Investments, Less than 12 Months, Unrealized Losses | (19) | (31)
HTM Investments, 12 Months or Longer, Fair Value | 1,287 | 2,185
HTM Investments, 12 Months or Longer, Unrealized Losses | (138) | (340)
HTM Investments, Total, Fair Value | 1,584 | 2,469
HTM Investments, Total, Unrealized Losses | (157) | (371)
AFS Investments [Member] |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
AFS Investments, Less than 12 Months, Fair Value | 702 | 912
AFS Investments, Less than 12 Months, Unrealized Losses | (4) | (36)
AFS Investments, 12 Months or Longer, Fair Value | 582 | 1,475
AFS Investments, 12 Months or Longer, Unrealized Losses | (148) | (442)
AFS Investments, Total, Fair Value | 1,284 | 2,387
AFS Investments, Total, Unrealized Losses | (152) | (478)
AFS Investments [Member] | Fixed-Maturity Investments [Member] |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
AFS Investments, Less than 12 Months, Fair Value | 701 | 820
AFS Investments, Less than 12 Months, Unrealized Losses | (4) | (33)
AFS Investments, 12 Months or Longer, Fair Value | 383 | 1,252
AFS Investments, 12 Months or Longer, Unrealized Losses | (124) | (385)
AFS Investments, Total, Fair Value | 1,084 | 2,072
AFS Investments, Total, Unrealized Losses | (128) | (418)
AFS Investments [Member] | Equity Securities [Member] |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
AFS Investments, Less than 12 Months, Fair Value | 1 | 47
AFS Investments, Less than 12 Months, Unrealized Losses |  | (3)
AFS Investments, 12 Months or Longer, Fair Value | 1 | 45
AFS Investments, 12 Months or Longer, Unrealized Losses |  | (16)
AFS Investments, Total, Fair Value | 2 | 92
AFS Investments, Total, Unrealized Losses |  | (19)
AFS Investments [Member] | Corporate Obligations [Member] | Fixed-Maturity Investments [Member] |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
AFS Investments, Less than 12 Months, Fair Value | 202 | 297
AFS Investments, Less than 12 Months, Unrealized Losses | (2) | (15)
AFS Investments, 12 Months or Longer, Fair Value | 57 | 418
AFS Investments, 12 Months or Longer, Unrealized Losses | (18) | (91)
AFS Investments, Total, Fair Value | 259 | 715
AFS Investments, Total, Unrealized Losses | (20) | (106)
AFS Investments [Member] | U.S. Treasury And Government Agency [Member] | Fixed-Maturity Investments [Member] |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
AFS Investments, Less than 12 Months, Fair Value | 234 | 200
AFS Investments, Less than 12 Months, Unrealized Losses | (1) |
AFS Investments, Total, Fair Value | 234 | 200
AFS Investments, Total, Unrealized Losses | (1) |
AFS Investments [Member] | State And Municipal Bonds [Member] | Fixed-Maturity Investments [Member] |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
AFS Investments, Less than 12 Months, Fair Value | 69 | 166
AFS Investments, Less than 12 Months, Unrealized Losses |  | (2)
AFS Investments, 12 Months or Longer, Fair Value | 87 | 151
AFS Investments, 12 Months or Longer, Unrealized Losses | (12) | (17)
AFS Investments, Total, Fair Value | 156 | 317
AFS Investments, Total, Unrealized Losses | (12) | (19)
AFS Investments [Member] | Foreign Governments [Member] | Fixed-Maturity Investments [Member] |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
AFS Investments, Less than 12 Months, Fair Value | 11 | 20
AFS Investments, 12 Months or Longer, Fair Value | 1 |
AFS Investments, Total, Fair Value | 12 | 20
AFS Investments [Member] | Residential Mortgage-Backed Agency [Member] | Mortgage-Backed Securities [Member] | Fixed-Maturity Investments [Member] |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
AFS Investments, Less than 12 Months, Fair Value | 173 | 20
AFS Investments, Less than 12 Months, Unrealized Losses | (1) |
AFS Investments, 12 Months or Longer, Fair Value | 38 | 49
AFS Investments, Total, Fair Value | 211 | 69
AFS Investments, Total, Unrealized Losses | (1) |
AFS Investments [Member] | Residential Mortgage-Backed Non-Agency [Member] | Mortgage-Backed Securities [Member] | Fixed-Maturity Investments [Member] |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
AFS Investments, Less than 12 Months, Fair Value | 4 | 34
AFS Investments, Less than 12 Months, Unrealized Losses |  | (5)
AFS Investments, 12 Months or Longer, Fair Value | 28 | 167
AFS Investments, 12 Months or Longer, Unrealized Losses | (8) | (78)
AFS Investments, Total, Fair Value | 32 | 201
AFS Investments, Total, Unrealized Losses | (8) | (83)
AFS Investments [Member] | Commercial Mortgage-Backed [Member] | Mortgage-Backed Securities [Member] | Fixed-Maturity Investments [Member] |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
AFS Investments, Less than 12 Months, Fair Value | 3 | 17
AFS Investments, Less than 12 Months, Unrealized Losses |  | (2)
AFS Investments, 12 Months or Longer, Fair Value | 27 | 22
AFS Investments, 12 Months or Longer, Unrealized Losses | (4) | (8)
AFS Investments, Total, Fair Value | 30 | 39
AFS Investments, Total, Unrealized Losses | (4) | (10)
AFS Investments [Member] | Collateralized Debt Obligations [Member] | Asset-Backed Securities [Member] | Fixed-Maturity Investments [Member] |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
AFS Investments, Less than 12 Months, Fair Value | 1 | 13
AFS Investments, Less than 12 Months, Unrealized Losses |  | (2)
AFS Investments, 12 Months or Longer, Fair Value | 80 | 117
AFS Investments, 12 Months or Longer, Unrealized Losses | (71) | (116)
AFS Investments, Total, Fair Value | 81 | 130
AFS Investments, Total, Unrealized Losses | (71) | (118)
AFS Investments [Member] | Other Asset-Backed [Member] | Asset-Backed Securities [Member] | Fixed-Maturity Investments [Member] |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
AFS Investments, Less than 12 Months, Fair Value | 4 | 53
AFS Investments, Less than 12 Months, Unrealized Losses |  | (7)
AFS Investments, 12 Months or Longer, Fair Value | 65 | 328
AFS Investments, 12 Months or Longer, Unrealized Losses | (11) | (75)
AFS Investments, Total, Fair Value | 69 | 381
AFS Investments, Total, Unrealized Losses | (11) | (82)
AFS Investments [Member] | Variable Interest Entity [Member] | Corporate Obligations [Member] |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
AFS Investments, Less than 12 Months, Fair Value |  | 2
AFS Investments, 12 Months or Longer, Fair Value | 31 |
AFS Investments, 12 Months or Longer, Unrealized Losses | (6) |
AFS Investments, Total, Fair Value | 31 | 2
AFS Investments, Total, Unrealized Losses | (6) |
AFS Investments [Member] | Variable Interest Entity [Member] | Residential Mortgage-Backed Non-Agency [Member] | Mortgage-Backed Securities [Member] |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
AFS Investments, Less than 12 Months, Fair Value |  | 3
AFS Investments, 12 Months or Longer, Fair Value | 82 | 90
AFS Investments, 12 Months or Longer, Unrealized Losses | (10) | (26)
AFS Investments, Total, Fair Value | 82 | 93
AFS Investments, Total, Unrealized Losses | (10) | (26)
AFS Investments [Member] | Variable Interest Entity [Member] | Collateralized Debt Obligations [Member] | Asset-Backed Securities [Member] |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
AFS Investments, Less than 12 Months, Fair Value |  | 9
AFS Investments, 12 Months or Longer, Fair Value | 85 | 88
AFS Investments, 12 Months or Longer, Unrealized Losses | (8) | (15)
AFS Investments, Total, Fair Value | 85 | 97
AFS Investments, Total, Unrealized Losses | (8) | (15)
AFS Investments [Member] | Variable Interest Entity [Member] | Other Asset-Backed [Member] | Asset-Backed Securities [Member] |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
AFS Investments, Less than 12 Months, Fair Value |  | 31
AFS Investments, Total, Fair Value |  | $ 31

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- Definition This item represents the fair value of securities categorized as held-to-maturity securities that have been in a continuous unrealized loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a(2) -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 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a(1) -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. + Details
Name: | us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant