Financing Arrangements and Derivative Financial Instruments - Amended and Restated Second Lien Term Loan Facility due 2019 (Details)	1 Months Ended
	Mar. 31, 2017	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Line of Credit Facility [Line Items]
Long-term debt, before deferred financing fees		$ 6,118,000,000	$ 5,235,000,000
Line of Credit | $2.0 billion first lien revolving credit facility due 2021
Line of Credit Facility [Line Items]
Maximum borrowing capacity		2,000,000,000.0
Line of Credit | Secured Debt | Second Lien Term Loan Facility due 2019
Line of Credit Facility [Line Items]
Total leverage ratio required to reduce basis, maximum	1.25
Debt instrument, optional reduction of basis spreads on variable rates	0.25%
Long-term debt, before deferred financing fees		$ 399,000,000	$ 399,000,000
Line of Credit | Secured Debt | Second Lien Term Loan Facility due 2019 | LIBOR
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	2.00%
Debt instrument, basis spread on reference rate	1.00%
Line of Credit | Secured Debt | Second Lien Term Loan Facility due 2019 | Alternative Base Rate
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	1.00%
Line of Credit | Secured Debt | Second Lien Term Loan Facility due 2019 | Federal Funds Rate
Line of Credit Facility [Line Items]
Debt instrument, basis spread on reference rate	0.50%