Variable Interest Entities (Narrative) (Details) (USD $)	Mar. 31, 2014	Mar. 31, 2013
Intangible Assets [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	$ 160,000,000
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	75,000,000
Intangible Assets [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss on assets	$ 1,200,000,000	$ 1,100,000,000