CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
NET INCOME	$ 272	$ 461
Net unrealized gains (losses) on cash flow hedges:
Effective portion of net unrealized gains (losses) (net of $27 tax expense and $2 tax benefit, respectively)	65	(7)
Reclassification from accumulated other comprehensive income to net income (net of $13 and $9 tax expense, respectively)	21	16
Net unrealized gains (losses) on available for sale securities:
Net unrealized gains on securities still held (net of $26 and $31 tax expense, respectively)	40	47
Reclassification from accumulated other comprehensive income to net income (net of $4 and $4 tax benefit, respectively)	(6)	(5)
Defined benefit pension and other benefits plans (net of $4 tax expense and $8 tax benefit, respectively)	7	(12)
Net unrealized gains (losses) on foreign currency translation (net of $5 tax benefit and $3 tax expense, respectively)	(9)	6
Other comprehensive income related to equity method investee (net of less than a million and $4 tax benefit, respectively)	1	15
Total other comprehensive income, net of tax	119	60
COMPREHENSIVE INCOME	$ 391	$ 521