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Debt (Principal Payments For Investment Agreements, MTNs and VIE Obligations) (Detail) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Total expected principal payments |  | $ 582 | $ 592
Investment Agreement Obligations [Member] |  |  |
Debt Instrument [Line Items] |  |  |
2016 |  | 36 |
2017 |  | 55 |
2018 |  | 17 |
2019 |  | 7 |
2020 |  | 37 |
Thereafter |  | 373 |
Total expected principal payments | [1] | 525 |
Less discount and other adjustments |  | 63 |
Total |  | 462 |
Less unamortized discount |  | 69 |
Accrued interest |  | 6 |
Medium Term Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
2016 |  | 112 |
2017 |  | 39 |
2018 |  | 59 |
2019 |  | 55 |
2020 |  | 1 |
Thereafter |  | 1,098 |
Total expected principal payments | [2] | 1,364 |
Less discount and other adjustments |  | 348 |
Total |  | 1,016 |
Less unamortized discount |  | 296 |
Fair value adjustments |  | 56 |
Accrued interest |  | 4 |
Variable Interest Entity Debt [Member] | International And Structured Finance Insurance [Member] |  |  |
Debt Instrument [Line Items] |  |  |
2016 |  | 567 |
2017 |  | 516 |
2018 |  | 505 |
2019 |  | 364 |
2020 |  | 314 |
Thereafter |  | 2,785 |
Total expected principal payments | [3] | 5,051 |
Net fair value |  | $ 2,400 |
[1] | Amounts reflect principal due at maturity for presented in investment agreements issued at a discount.
[2] | Amounts reflect principal due at maturity for notes issued at a discount or premium.
[3] | Includes $2.4 billion of VIE notes accounted for at fair value as of December 31, 2015.

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- Definition Carrying value as of the balance sheet date of the sum of the obligations to contract holders to provide to them an agreed upon rate of return pursuant to the terms of the underlying contract. These contracts represent lending by the contract holders to the entity in return for a guaranteed (primarily fixed) interest rate until maturity, unless called earlier if the contracts provide that option to the contract holders (usually institutions). There is little or no insurance risk for the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.14) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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