Fair Value Measurements (Assets and Liabilities Measured At Fair Value On A Recurring Basis Using Unobservable Inputs (Level 3)) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Document Fiscal Year Focus	2014
Contingent consideration
Balance at the beginning of the period	$ 59	$ 103
Losses included in earnings		(5)
Settlements	(12)	(39)
Balance at the end of the period	$ 47	$ 59