v2.4.0.8

Investments (Aggregate Fair Value And Gross Unrealized Loss By Length Of Time Security Has Continuously Been In Unrealized Loss Position) (Detail) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Investment [Line Items] |  |
Investment securities, Unrealized loss position, 0-12 Months, Fair Value | $ 10,464 | $ 18,228
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss | (128) | (652)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value | 5,436 | 894
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss | (136) | (63)
Investment securities, Unrealized loss position, Total Fair Value | 15,900 | 19,122
Investment securities, Unrealized loss position, Total Gross Unrealized Loss | (264) | (715)
US Treasury and Government [Member] |  |
Investment [Line Items] |  |
Investment securities, Unrealized loss position, 0-12 Months, Fair Value | 439 | 1,794
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss | (2) | (57)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value | 943 | 31
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss | (20) | (6)
Investment securities, Unrealized loss position, Total Fair Value | 1,382 | 1,825
Investment securities, Unrealized loss position, Total Gross Unrealized Loss | (22) | (63)
Foreign Government Debt Securities [Member] |  |
Investment [Line Items] |  |
Investment securities, Unrealized loss position, 0-12 Months, Fair Value | 2,420 | 4,621
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss | (34) | (114)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value | 916 | 201
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss | (19) | (8)
Investment securities, Unrealized loss position, Total Fair Value | 3,336 | 4,822
Investment securities, Unrealized loss position, Total Gross Unrealized Loss | (53) | (122)
Corporate Securities [Member] |  |
Investment [Line Items] |  |
Investment securities, Unrealized loss position, 0-12 Months, Fair Value | 4,943 | 3,836
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss | (72) | (118)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value | 854 | 194
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss | (25) | (14)
Investment securities, Unrealized loss position, Total Fair Value | 5,797 | 4,030
Investment securities, Unrealized loss position, Total Gross Unrealized Loss | (97) | (132)
Collateralized Mortgage Backed Securities [Member] |  |
Investment [Line Items] |  |
Investment securities, Unrealized loss position, 0-12 Months, Fair Value | 2,206 | 5,248
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss | (11) | (197)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value | 2,050 | 384
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss | (64) | (31)
Investment securities, Unrealized loss position, Total Fair Value | 4,256 | 5,632
Investment securities, Unrealized loss position, Total Gross Unrealized Loss | (75) | (228)
US States and Political Subdivisions Debt Securities [Member] |  |
Investment [Line Items] |  |
Investment securities, Unrealized loss position, 0-12 Months, Fair Value | 311 | 2,164
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss | (1) | (90)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value | 673 | 84
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss | (8) | (4)
Investment securities, Unrealized loss position, Total Fair Value | 984 | 2,248
Investment securities, Unrealized loss position, Total Gross Unrealized Loss | (9) | (94)
Fixed Maturities [Member] |  |
Investment [Line Items] |  |
Investment securities, Unrealized loss position, 0-12 Months, Fair Value | 10,319 | 17,663
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss | (120) | (576)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value | 5,436 | 894
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss | (136) | (63)
Investment securities, Unrealized loss position, Total Fair Value | 15,755 | 18,557
Investment securities, Unrealized loss position, Total Gross Unrealized Loss | (256) | (639)
Equity Securities [Member] |  |
Investment [Line Items] |  |
Investment securities, Unrealized loss position, 0-12 Months, Fair Value | 67 | 498
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss | (5) | (67)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value | 0 | 0
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss | 0 | 0
Investment securities, Unrealized loss position, Total Fair Value | 67 | 498
Investment securities, Unrealized loss position, Total Gross Unrealized Loss | (5) | (67)
Other Long-term Investments [Member] |  |
Investment [Line Items] |  |
Investment securities, Unrealized loss position, 0-12 Months, Fair Value | 78 | 67
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss | (3) | (9)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value | 0 | 0
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss | 0 | 0
Investment securities, Unrealized loss position, Total Fair Value | 78 | 67
Investment securities, Unrealized loss position, Total Gross Unrealized Loss | $ (3) | $ (9)

X
- Details
Name: | invest_InvestmentLineItems
Namespace Prefix: | invest_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: 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=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: 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=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: 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=27724398&loc=d3e27290-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References Reference 1: 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=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References Reference 1: 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=27724398&loc=d3e27337-111563 Reference 2: 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=27724398&loc=d3e27290-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading 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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: 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=27724398&loc=d3e27290-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant