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Derivatives and Hedging Activities - Largest Exposure to Individual Counterparty (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Derivative [Line Items]
Net exposure after netting adjustments and collateral	$ 731us-gaap_DerivativeAssets	$ 609us-gaap_DerivativeAssets	$ 427us-gaap_DerivativeAssets
Largest Individual Counterparty [Member]
Derivative [Line Items]
Largest gross exposure (derivative asset) to an individual counterparty	122	133	118
Collateral posted by this counterparty	91	100	43
Derivative liability with this counterparty	28	31	108
Collateral pledged to this counterparty			40
Net exposure after netting adjustments and collateral	$ 3	$ 2	$ 7

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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