CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Changes in unrealized gains (losses) - taxes (benefits)	$ 35	$ (17)	$ 49	$ (15)
Reclassification adjustment for net losses (gains) realized in net income - benefits (taxes)	(3)	(2)	(6)	(5)
Changes in market value of derivatives - taxes (benefits)	1	1	0	2
Reclassification adjustment for net losses (gains) realized in net income - benefits (taxes)	$ 0	$ 0	$ 0	$ (1)