Financial Instruments and Risk Management (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Derivative [Line Items]
Pre-tax net losses on cash flow hedges to be reclassified from AOCE into earnings in next twelve months			$ 29,000,000
Accretion expense	8,700,000	8,000,000	17,100,000	15,700,000
Contingent consideration | Minimum
Derivative [Line Items]
Rate used to discount net cash inflows to present value			0.90%
Contingent consideration | Maximum
Derivative [Line Items]
Rate used to discount net cash inflows to present value			10.80%
Changes during the period
Derivative [Line Items]
Adjustment to contingent consideration liability		10,000,000		11,900,000
Purchased cash convertible note hedge
Derivative [Line Items]
Fair value of credit risk derivatives	$ 1,650,000,000		$ 1,650,000,000