Segment Information (Net Revenue By Revenue Composition) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenue	$ 1,123	$ 808	$ 695	$ 949	$ 1,209	$ 922	$ 711	$ 955	$ 3,575	$ 3,797	$ 4,143
Packaged Goods and other
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenue									1,663	2,255	2,761
Digital [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenue									1,833	1,440	1,159
Distribution
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenue									$ 79	$ 102	$ 223