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Derivative Financial Instruments - Collateral Held and Pledged (Detail) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Collateral held:
Cash (obligation to return cash collateral is recorded in short-term borrowings)	$ 317	$ 345
Securities at fair value - corporate derivatives (not recorded in financial statements)	97	193
Securities at fair value - on-balance sheet securitization derivatives (not recorded in financial statements)	237	230
Total collateral held	651	768
Derivative asset at fair value including accrued interest	526	689
Collateral pledged to others:
Cash (right to receive return of cash collateral is recorded in investments)	282	319
Total collateral pledged	282	319
Derivative liability at fair value including accrued interest and premium receivable	$ 1,510	$ 1,670

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Collateral Held [Abstract]

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Collateral Pledged To Others [Abstract]

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Derivative asset at fair value including accrued interest.

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- Definition

Securities Fair Value On Balance Sheet Securitization Derivatives

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- Definition

Fair value of securities received as collateral against derivative assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226013-175313

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- Definition

Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=d3e41678-113959

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section 55
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226016-175313

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Amount of obligation to return securities collateral under master netting arrangements that have not been offset against derivative assets.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
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-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226016-175313

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Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

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-Publisher FASB
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Fair value of securities pledged as collateral against derivative liabilities.

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-Topic 210
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The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 4H
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