Debt (Principal Payments For Investment Agreements, MTNs and VIE Obligations) (Detail) (USD $) In Millions, unless otherwise specified			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Investment Agreement Obligations [Member]		Dec. 31, 2013 Medium Term Notes [Member]		Dec. 31, 2013 Variable Interest Entity Debt [Member]		Dec. 31, 2013 Variable Interest Entity Debt [Member] Structured Finance And International Insurance [Member]	Dec. 31, 2013 Variable Interest Entity Debt [Member] Conduits [Member]
Debt Instrument [Line Items]
2014			$ 133		$ 30		$ 344	[1]	$ 344	$ 0
2015			41		197		402	[1]	402	0
2016			46		133		297	[1]	297	0
2017			56		54		360	[1]	360	0
2018			17		59		356	[1]	356	0
Thereafter			484		1,435		3,527	[1]	3,398	129
Total expected principal payments	592	732	777	[2]	1,908	[3]	5,286	[1]	5,157	129
Less discount and other adjustments			77	[4]	481	[5]
Total			700		1,427
Less unamortized discount	0	1	84		417
Fair value adjustments					72
Accrued interest			7		8
Net fair value							$ 2,400

[1] Includes $2.4 billion of VIE notes accounted for at fair value as of December 31, 2013.

[2] Amounts reflect principal due at maturity for presented in investment agreements issued at a discount.

[3] Amounts reflect principal due at maturity for notes issued at a discount or premium.

[4] Includes discounts of $84 million on investment agreements, net of accrued interest of $7 million.

[5] Includes discounts of $417 million, fair value adjustments of $72 million, net of accrued interest of $8 million.