Segment Information (Net Revenue By Revenue Composition) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenue	$ 1,527	$ 1,149	$ 898	$ 1,271	$ 1,308	$ 1,070	$ 815	$ 1,203	$ 4,845	$ 4,396	$ 4,515
Packaged Goods and other
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenue									1,971	1,987	2,316
Digital [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenue									$ 2,874	$ 2,409	$ 2,199