Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Fair market value adjustment on cash flow hedges, tax provision				$ 1
Reclassification adjustment for net realized losses on cash flow hedges included in interest expense, tax provision	$ 3	$ 1	$ 4	$ 2