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Debt (Summary of Outstanding Debt) (Details)	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2016 EUR (€)	Sep. 30, 2016 USD ($)	Sep. 30, 2016 EUR (€)	Feb. 29, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2015 EUR (€)	May 31, 2015 EUR (€)
Debt Instrument [Line Items]
Short-term debt	$ 33,000,000					$ 54,000,000
Principal outstanding
Total long-term debt	4,931,000,000					5,528,000,000
Less: current maturities	(162,000,000)					(211,000,000)
Total long-term debt, less current maturities	4,769,000,000					5,317,000,000
Carrying amount
Total long-term debt	4,878,000,000					5,464,000,000
Less: current maturities	(161,000,000)					(209,000,000)
Total long-term debt, less current maturities	4,717,000,000					5,255,000,000
Line of Credit [Member]
Principal outstanding
Total long-term debt
Carrying amount
Total long-term debt
Senior Secured Borrowings [Member] | U.S. Dollar at LIBOR plus 1.75% due 2018 [Member]
Principal outstanding
Total long-term debt	654,000,000					831,000,000
Carrying amount
Total long-term debt	$ 649,000,000					821,000,000
Basis spread on variable rate (as a percent)	1.75%
Senior Secured Borrowings [Member] | Euro at EURIBOR plus 1.75% due 2018 [Member]
Principal outstanding
Total long-term debt	$ 61,000,000					723,000,000
Carrying amount
Total long-term debt	$ 61,000,000					714,000,000
Basis spread on variable rate (as a percent)	1.75%
Debt instrument, face amount | €		€ 58,000,000					€ 665,000,000
Senior Secured Borrowings [Member] | Farm Credit Facility at LIBOR Plus 2.00% due 2019 [Member]
Principal outstanding
Total long-term debt	$ 351,000,000					355,000,000
Carrying amount
Total long-term debt	$ 347,000,000					350,000,000
Basis spread on variable rate (as a percent)	2.00%
Senior Notes and Debentures [Member] | U.S. Dollar 6.25% due 2021 [Member]
Principal outstanding
Total long-term debt	$ 0				$ 700,000,000	700,000,000
Carrying amount
Total long-term debt	$ 0					694,000,000
Debt instrument stated percentage	6.25%	6.25%			6.25%
Senior Notes and Debentures [Member] | Euro 650 4.0% due 2022 [Member]
Principal outstanding
Total long-term debt	$ 684,000,000					706,000,000
Carrying amount
Total long-term debt	$ 676,000,000					697,000,000
Debt instrument stated percentage	4.00%	4.00%
Debt instrument, face amount | €		€ 650,000,000
Senior Notes and Debentures [Member] | U.S. Dollar 4.50% due 2023 [Member]
Principal outstanding
Total long-term debt	$ 1,000,000,000					1,000,000,000
Carrying amount
Total long-term debt	$ 991,000,000					989,000,000
Debt instrument stated percentage	4.50%	4.50%
Senior Notes and Debentures [Member] | Euro 600 2.625% due 2024 [Member]
Principal outstanding
Total long-term debt	$ 631,000,000					0
Carrying amount
Total long-term debt	$ 623,000,000					0
Debt instrument stated percentage	2.625%	2.625%	2.625%	2.625%
Debt instrument, face amount | €		€ 600,000,000		€ 600,000,000
Senior Notes and Debentures [Member] | Euro 600 3.375% due 2025 [Member]
Principal outstanding
Total long-term debt	$ 631,000,000					652,000,000		€ 600,000,000
Carrying amount
Total long-term debt	$ 622,000,000					642,000,000
Debt instrument stated percentage	3.375%	3.375%						3.375%
Debt instrument, face amount | €		€ 600,000,000
Senior Notes and Debentures [Member] | U.S. Dollar 4.25% due 2026 [Member]
Principal outstanding
Total long-term debt	$ 400,000,000		$ 400,000,000			0
Carrying amount
Total long-term debt	$ 393,000,000					0
Debt instrument stated percentage	4.25%	4.25%	4.25%	4.25%
Senior Notes and Debentures [Member] | U.S. Dollar 7.375% due 2026 [Member]
Principal outstanding
Total long-term debt	$ 350,000,000					350,000,000
Carrying amount
Total long-term debt	$ 347,000,000					346,000,000
Debt instrument stated percentage	7.375%	7.375%
Senior Notes and Debentures [Member] | U.S. Dollar 7.50% due 2096 [Member]
Principal outstanding
Total long-term debt	$ 45,000,000					45,000,000
Carrying amount
Total long-term debt	$ 45,000,000					45,000,000
Debt instrument stated percentage	7.50%	7.50%
Other Indebtedness, Fixed Rate [Member]
Principal outstanding
Total long-term debt	$ 122,000,000					146,000,000
Carrying amount
Total long-term debt	122,000,000					146,000,000
Other Indebtedness, Variable Rate [Member]
Principal outstanding
Total long-term debt	2,000,000					20,000,000
Carrying amount
Total long-term debt	$ 2,000,000					$ 20,000,000
Average variable rates	2.15%	2.15%
Minimum [Member] | Other Indebtedness, Fixed Rate [Member]
Carrying amount
Debt instrument stated percentage	3.94%	3.94%
Maximum [Member] | Other Indebtedness, Fixed Rate [Member]
Carrying amount
Debt instrument stated percentage	8.50%	8.50%

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