(Assets And Liabilities Measured At Fair Value On A Nonrecurring Basis) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Acquisition Related Intangible Assets [Member]	Mar. 31, 2014 Fair Value, Measurements, Nonrecurring [Member]	Mar. 31, 2013 Fair Value, Measurements, Nonrecurring [Member]	Mar. 31, 2013 Cost Of Revenue [Member]	Mar. 31, 2013 Amortization of intangibles [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value						$ 4
Total impairments recorded on a nonrecurring basis	$ 1	$ 31	$ 6	$ 39	$ 12	$ 39	$ 17	$ 39	$ 34	$ 5