Segment Information (Net Revenue By Revenue Composition) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenue	$ 1,308	$ 1,070	$ 815	$ 1,203	$ 1,185	$ 1,126	$ 990	$ 1,214	$ 4,396	$ 4,515	$ 3,575
Packaged Goods and other
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenue									1,987	2,316	1,742
Digital [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenue									$ 2,409	$ 2,199	$ 1,833