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Debt (Narrative) (Details)	1 Months Ended		3 Months Ended			12 Months Ended
	Apr. 28, 2017 EUR (€)	Feb. 29, 2016 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)	Apr. 28, 2017 USD ($)	Mar. 31, 2017 EUR (€)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 EUR (€)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)
Debt Instrument [Line Items]
Loss from early extinguishments of debt				$ 0	$ 27,000,000
Proceeds from long-term debt				$ 4,000,000	303,000,000
Long-term debt									$ 5,314,000,000		$ 4,931,000,000
Forecast [Member]
Debt Instrument [Line Items]
Loss from early extinguishments of debt			$ 8,000,000
Senior Secured Borrowings [Member] | Term A Facility Due April 2022, LIBOR plus 1.75% [Member] | Subsequent event [Member]
Debt Instrument [Line Items]
Debt, face amount							$ 750,000,000
Senior Secured Borrowings [Member] | Term Euro Facility, Due April 2022, LIBOR plus 1.75% [Member] | Subsequent event [Member]
Debt Instrument [Line Items]
Debt, face amount | €	€ 275,000,000
Senior Secured Borrowings [Member] | U.S. Dollar at LIBOR plus 1.75% due 2018 [Member]
Debt Instrument [Line Items]
Proceeds from long-term debt		$ 300,000,000
Long-term debt									654,000,000		654,000,000
Senior Secured Borrowings [Member] | Euro at EURIBOR plus 1.75% due 2018 [Member]
Debt Instrument [Line Items]
Debt, face amount | €								€ 58,000,000
Long-term debt									62,000,000		61,000,000
Senior Notes and Debentures [Member] | U.S. Dollar 6.25% due 2021 [Member]
Debt Instrument [Line Items]
Loss from early extinguishments of debt					$ 27,000,000
Long-term debt		$ 700,000,000
Debt instrument stated percentage		6.25%
Senior Notes and Debentures [Member] | Euro 2.625% due 2024 [Member]
Debt Instrument [Line Items]
Debt, face amount | €								€ 600,000,000		€ 600,000,000
Long-term debt									$ 641,000,000		$ 631,000,000
Debt instrument stated percentage								2.625%	2.625%	2.625%	2.625%
Senior Notes and Debentures [Member] | U S Dollar 4.25% Due 2026 [Member]
Debt Instrument [Line Items]
Debt, face amount												$ 400,000,000
Long-term debt									$ 400,000,000		$ 400,000,000
Debt instrument stated percentage								4.25%	4.25%			4.25%
Senior Notes and Debentures [Member] | Euro at EURIBOR plus 1.75% due 2018 [Member]
Debt Instrument [Line Items]
Loss from early extinguishments of debt						$ 37,000,000
Fair Value, Inputs, Level 2 [Member]
Debt Instrument [Line Items]
Long-term debt, fair value									$ 5,451,000,000		5,043,000,000
London Interbank Offered Rate (LIBOR) [Member] | Senior Secured Borrowings [Member] | Term A Facility Due April 2022, LIBOR plus 1.75% [Member] | Subsequent event [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	1.75%
London Interbank Offered Rate (LIBOR) [Member] | Senior Secured Borrowings [Member] | Term Euro Facility, Due April 2022, LIBOR plus 1.75% [Member] | Subsequent event [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	1.75%
London Interbank Offered Rate (LIBOR) [Member] | Senior Secured Borrowings [Member] | U.S. Dollar at LIBOR plus 1.75% due 2018 [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				1.75%
Revolving Credit Facility [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Long-term debt									$ 354,000,000		$ 0
Revolving Credit Facility [Member] | Line of Credit [Member] | Subsequent event [Member]
Debt Instrument [Line Items]
Debt, face amount							$ 1,400,000,000
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Line of Credit [Member] | Subsequent event [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	1.75%

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