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Premium paid to redeem 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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after accumulated amortization, of debt discount.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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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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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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Number of shares that have been repurchased during the period and are being held in treasury.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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Debt Additional Information (Details) - USD ($) shares in Millions, $ in Millions		1 Months Ended		3 Months Ended			6 Months Ended		12 Months Ended
	Apr. 01, 2018	Feb. 12, 2019	Mar. 31, 2017	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Mar. 01, 2017
Debt Instrument [Line Items]
Treasury Stock, Value, Acquired, Cost Method				$ 383		$ 1,329	$ 679	$ 1,439	$ 1,721	$ 891
Proceeds from Lines of Credit		$ 100							150
Long-term Debt, Gross				$ 7,897	$ 7,361		$ 7,897		7,361	6,683
Senior secured term loan facility due 2026 [Member]
Debt Instrument [Line Items]
Debt Discount, Percent				0.25%			0.25%
Debt Instrument, Interest Rate, Stated Percentage				4.15%			4.15%
Debt Issuance Costs, Gross				$ 2			$ 2
Repayments of Debt							500
Write off of Deferred Debt Issuance Cost							8
Long-term Debt, Gross				$ 2,619	$ 3,119		$ 2,619		$ 3,119
Senior notes due 2026 [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Long-term Debt	$ 1,500
Debt Instrument, Interest Rate, Stated Percentage	5.125%			5.125%	5.125%		5.125%		5.125%
Debt Issuance Costs, Gross	$ 21
Long-term Debt, Gross				$ 1,500	$ 1,500		$ 1,500		$ 1,500	0
Senior secured term loan facility due 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					4.26%				4.26%
Repayments of Long-term Debt	$ 500				$ 300
Debt Instrument, Unamortized Discount					8				$ 8
Debt Instrument, Interest Rate, Increase (Decrease)	0.25%
Debt Instrument, Basis Spread on Variable Rate	1.75%
Long-term Debt, Gross					$ 3,119				$ 3,119	3,929
Senior notes due 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				4.625%	4.625%		4.625%		4.625%		4.625%
Long-term Debt, Gross				$ 900	$ 900		$ 900		$ 900	900
Senior notes due 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				4.875%	4.875%		4.875%		4.875%		4.875%
Long-term Debt, Gross				$ 600	$ 600		$ 600		$ 600	600
Senior notes due 2021 [Member]
Debt Instrument [Line Items]
Repayments of Long-term Debt			$ 1,500
Premium paid to redeem debt instrument										42
Write off of Deferred Debt Issuance Cost										18
Senior notes due 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				4.25%	4.25%		4.25%		4.25%
Long-term Debt, Gross				$ 1,000	$ 1,000		$ 1,000		$ 1,000	$ 1,000
Senior secured revolving credit facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					1,000				1,000
Letters of Credit Outstanding, Amount					63				63
Line of Credit Facility, Remaining Borrowing Capacity					937				$ 937
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage									0.125%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Issuance Costs, Gross				7			7
Repayments of Debt							225
Line of Credit Facility, Maximum Borrowing Capacity				1,750			1,750
Line of Credit Facility, Remaining Borrowing Capacity				$ 1,690			$ 1,690
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage							0.125%
Senior notes due 2030 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				4.875%			4.875%
Debt Issuance Costs, Gross				$ 13			$ 13
Long-term Debt, Gross				1,000	$ 0		1,000		$ 0
Other stockholder [Member]
Debt Instrument [Line Items]
Treasury Stock, Shares, Acquired	16.5
Treasury Stock, Value, Acquired, Cost Method	$ 1,171
Letter of Credit [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity				250			250
Letters of Credit Outstanding, Amount				$ 59			$ 59