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Debt (Principal Payments For Investment Agreements, MTNs and VIE Obligations) (Detail) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Accrued interest |  | $ 506 | $ 394
Investment Agreement Obligations [Member] |  |  |
Debt Instrument [Line Items] |  |  |
2017 |  | 56 |
2018 |  | 17 |
2019 |  | 7 |
2020 |  | 35 |
2021 |  | 3 |
Thereafter |  | 342 |
Total expected principal payments | [1] | 460 |
Less discount and other adjustments | [2] | 61 |
Total |  | 399 |
Less unamortized discount |  | 66 |
Accrued interest |  | 5 |
Medium Term Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
2017 |  | 36 |
2018 |  | 57 |
2019 |  | 54 |
2020 |  | 0 |
2021 |  | 106 |
Thereafter |  | 975 |
Total expected principal payments | [3] | 1,228 |
Less discount and other adjustments | [4] | 333 |
Total |  | 895 |
Less unamortized discount |  | 279 |
Accrued interest |  | 3 |
Fair value adjustments |  | 57 |
Variable Interest Entity Debt [Member] | International And Structured Finance Insurance [Member] |  |  |
Debt Instrument [Line Items] |  |  |
2017 |  | 220 |
2018 |  | 238 |
2019 |  | 173 |
2020 |  | 124 |
2021 |  | 140 |
Thereafter |  | 1,346 |
Total expected principal payments | [5] | 2,241 |
Net fair value |  | $ 1,400 |
[1] | Amounts reflect principal due at maturity for investment agreements issued at a discount.
[2] | Includes discounts net of carrying amount adjustments of $66 million, net of accrued interest of $5 million.
[3] | Amounts reflect principal due at maturity for notes issued at a discount.
[4] | Includes discounts net of carrying amount adjustments and bifurcated embedded derivatives of $279 million, fair value adjustments of $57 million, net of accrued interest of $3 million.
[5] | Includes $1.4 billion of VIE notes accounted for at fair value as of December 31, 2016.

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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 20 -Article 5 Reference 3: 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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