Condensed Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Statement [Abstract]
Income from operations of discontinued businesses, income tax expense	$ 0	$ 8	$ 0	$ 22	[1]
Net loss from disposal and impairments of discontinued businesses, income tax expense	$ 0	$ 5	$ 0	$ 4

[1] Three Months Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 (in millions)Revenue$— $104 $— $233Income from operations of discontinued businesses, before income tax$— $15 $— $49Income tax expense— (8) — (22)Income from operations of discontinued businesses, after income tax$— $7 $— $27Net loss from disposal & impairments of discontinued businesses, after income tax$— $(13) $— $(56)