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Debt - Credit Facility, Senior Notes, and Loan Repricing (Details) - USD ($) $ in Millions				3 Months Ended		12 Months Ended
	Jul. 10, 2018	Jun. 28, 2018	Jun. 27, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 07, 2016
Line of Credit Facility [Line Items]
Letters of Credit Outstanding, Amount				$ 12		$ 12
Write off of Deferred Debt Issuance Cost				3
Repayments of Debt	$ 476
Redemption Premium	95
Write Off Of Unamortized Discount And Deferred Debt Issuance Cost	$ 13
Debt Instrument, Redemption, Period Two [Member] | Senior Notes [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Redemption Price, Percentage						100.00%
Debt Instrument, Redemption, Period One [Member] | Senior Notes [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Redemption Price, Percentage						110.50%
Debt Instrument, Redemption Percentage						35.00%
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit Facility Leverage Terms Low						225.00%
Credit Facility Leverage Terms Foreign Subsidiary						65.00%
Credit Facility Subsidiary Leverage Terms Low after Sept 30, 2018						3.75
Term Loan A due 2021 [Member]
Line of Credit Facility [Line Items]
Letter of credit sub-facility							$ 700
Term Loan B due 2023 [Member]
Line of Credit Facility [Line Items]
Letter of credit sub-facility				$ 833	$ 842	$ 833	850
Debt Instrument, Interest Rate, Increase (Decrease)		(0.50%)
Term Loan B due 2023 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate			3.00%
Term Loan B due 2023 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate		2.50%
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity							$ 750
Debt Instrument, Interest Rate, Increase (Decrease)				(0.50%)
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate				1.75%	2.25%
Letter of Credit [Member]
Line of Credit Facility [Line Items]
Letter of credit sub-facility				$ 300		300
Senior Notes due 2024 [Member]
Line of Credit Facility [Line Items]
Letter of credit sub-facility				$ 34	$ 510	$ 34
Debt Instrument, Interest Rate, Stated Percentage				10.50%		10.50%
Term Loan A due 2022 [Member]
Line of Credit Facility [Line Items]
Letter of credit sub-facility				$ 705	$ 732	$ 705
Debt Instrument, Interest Rate, Increase (Decrease)		(0.50%)
Term Loan A due 2022 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate			2.25%
Term Loan A due 2022 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.75%

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Debt Instrument, Redemption Percentage

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Incremental percentage increase (decrease) in the stated rate on a debt instrument.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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