Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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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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No definition available.

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The number of derivative instruments of a particular group held by the entity.

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The net gain (loss) recognized in earnings during the period due to the ineffectiveness on interest rate fair value hedges.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The loss recognized on termination of a contract.

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Financial Instruments (Interest Rate Risk) (Details)	12 Months Ended
Financial Instruments (Interest Rate Risk) (Details)	Dec. 31, 2018 USD ($) swap	Dec. 31, 2017 USD ($) swap	Sep. 30, 2018 USD ($)	Aug. 20, 2018 USD ($)	Oct. 31, 2017 USD ($)	Oct. 01, 2017 USD ($)	Sep. 12, 2017 USD ($)	Nov. 13, 2015 USD ($)	Jan. 28, 2013 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Long-term Debt, Current Maturities	$ 0
Debt, principal amount	6,500,000,000	$ 5,000,000,000
Senior Notes
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Debt, principal amount				$ 1,500,000,000			$ 1,250,000,000	$ 1,250,000,000	$ 3,650,000,000
Senior Notes \| 1.875% 2013 senior notes due 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Long-term Debt, Current Maturities					$ 750,000,000
Senior Notes \| 4.500% 2015 senior notes due 2025
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Debt, stated interest percentage rate								4.50%
Debt, principal amount	750,000,000	750,000,000
Derivatives Designated as Hedging Instruments \| Interest Rate Swap
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Aggregate notional amount	350,000,000	500,000,000
Amount of payment for settlement	2,000,000	$ 3,000,000
Amount of ineffectiveness related to forward swaps	$ 100,000
Number of derivative instruments \| swap	0	0
Derivatives Designated as Hedging Instruments \| Interest Rate Swap \| Senior Notes \| 1.875% 2013 senior notes due 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Debt, stated interest percentage rate									1.875%
Derivatives Designated as Hedging Instruments \| Treasury Lock
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Aggregate notional amount			$ 350,000,000			$ 500,000,000