Debt (Debt Issuance Costs and Original Issue Discount) (Details) - USD ($)		3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 28, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Extinguishment of Debt [Line Items]
Debt issuance cost				$ 18,100,000		$ 20,000,000
Loss on debt extinguishment		$ 0	$ 6,000,000	0	$ 6,000,000
Amortization of debt issuance costs and original issue discount		$ (1,000,000)	(1,000,000)	$ (2,200,000)	(2,100,000)
$1.5 billion debt financing arrangement [Member]
Extinguishment of Debt [Line Items]
Debt instrument			1,500,000,000.0		1,500,000,000.0
$1.9 billion debt financing arrangement [Member]
Extinguishment of Debt [Line Items]
Debt issuance cost	$ 14,300,000
Debt instrument	$ 1,900,000,000		1,900,000,000.0		1,900,000,000.0
Other Noncurrent Assets [Member] | $1.9 billion debt financing arrangement [Member]
Extinguishment of Debt [Line Items]
Debt issuance cost			11,000,000		11,000,000
Debt Issuance Cost [Member] | $1.5 billion debt financing arrangement [Member]
Extinguishment of Debt [Line Items]
Loss on debt extinguishment			2,100,000		2,100,000
Debt Issuance Cost [Member] | $1.9 billion debt financing arrangement [Member]
Extinguishment of Debt [Line Items]
Loss on debt extinguishment			3,300,000		3,300,000
Original Issue Discount [Member] | $1.5 billion debt financing arrangement [Member]
Extinguishment of Debt [Line Items]
Loss on debt extinguishment			$ 600,000		$ 600,000