Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Unrealized gains (losses) on cash flow hedging instruments:
Balance at beginning of period	$ (358)		$ (494)	$ (575)
Net gains arising during period, net of tax of $67 million, $65 million and $29 million, respectively	123		118	45
Reclassification adjustment for losses realized in net income, net of tax of $76 million, $10 million and $23 million, respectively	138	[1]	18	36
Total other comprehensive income for period	261		136	81
Balance at end of period	(97)		(358)	(494)
Unrealized gains (losses) on securities available-for-sale, not other-than temporarily impaired:
Balance at beginning of period	115		102	78
Reclassification of unrealized losses on other-than-temporary impaired debt securities, net of tax of $- million, $- million and $- million, respectively	0		1	0
Net unrealized holding gains arising during period, net of tax of $- million, $16 million and $33 million, respectively	0		28	60
Reclassification adjustment for losses realized in net income, net of tax of $(62)million, $(9) million and $(20) million, respectively	(115)	[2]	(16)	(36)
Total other comprehensive income (loss) for period	(115)		12	24
Balance at end of period	0		115	102
Unrealized gains (losses) on other-than-temporarily impaired debt securities available-for-sale:
Balance at beginning of period	1		0	(4)
Reclassification of unrealized gains on other-than-temporary impaired debt securities, net of tax of $- million, $- million and $- million, respectively	0		(1)	0
Other-than-temporary impairment on debt securities available-for-sale recognized in other comprehensive income, net of tax of $- million, $1 million and $(1) million, respectively	0		2	(1)
Reclassification adjustment for gains realized in net income, net of tax of $(1) million, $- million and $4 million, respectively	(1)	[2]	0	5
Total other comprehensive income (loss) for period	(1)		2	4
Balance at end of period	0		1	0
Pension and postretirement benefit plan liability:
Balance at beginning and end of period	(26)		(11)	0
Change in unfunded pension and postretirement liability, net of tax of $7 million, $(9) million and $(7) million, respectively	14		(17)	(12)
Reclassification adjustment for losses realized in net income, net of tax of $1 million, $1 million and $1 million, respectively	1	[3]	2	1
Total other comprehensive income for period	15		(15)	(11)
Balance at end of period	(11)		(26)	(11)
Foreign currency translation adjustments:
Balance at beginning of period	11		7	10
Translation losses, net of tax of $(1) million, $1 million and $(1) million, respectively	(5)		4	(3)
Reclassification adjustment for gains realized in net income, net of tax of $(9) million, $- million and $- million, respectively	(6)	[1]	0
Total other comprehensive income (loss) for period	(11)		4	(3)
Balance at end of period	0		11	7
Total accumulated other comprehensive loss at end of period	$ (108)		$ (257)	$ (396)

[1] See the tables below for the components of the amounts reclassified during 2013 into income and location in our consolidated statement of income (loss).

[2] The amounts reclassified during 2013 are included in income (loss) from discontinued operations in our consolidated statement of income (loss).

[3] The amounts reclassified during 2013 are included as a component of salaries and employee benefits in our consolidated statement of income (loss).