Derivatives and Hedging Activities - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 30, 2013	Dec. 31, 2013
Derivative [Line Items]
Net Gains (Losses), Including Hedges, Attributable to the Impact of Changes in Credit Exposure and Credit Spreads on Derivative Contracts	$ 93,000,000	$ (83,000,000)
Maximum Payout/Notional Amount of Written Credit Derivative	1,414,045,000,000		1,434,396,000,000
Maximum Payout/Notional Amount of Purchased Credit Derivatives	1,490,000,000,000		1,520,000,000,000
Net purchased protection notional value of credit derivatives	79,560,000,000		81,550,000,000
Foreign Currency Denominated Debt Designated As Foreign Currency Hedge	$ 2,010,000,000		$ 1,970,000,000
Commodity [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Approximate length of time of the cash flow hedge	2 years