Face (par) amount of debt instrument at time of issuance.

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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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Gross amount of debt extinguished.

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Interest and debt related expenses associated with nonoperating financing activities of the entity.

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Amount of cash paid for interest, including, but not limited to, capitalized interest and payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount; classified as operating and investing activities.

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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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- Definition

The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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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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Debt and Lines of Credit - Additional Information (Details) - USD ($)	1 Months Ended						3 Months Ended			12 Months Ended
	Aug. 31, 2019	May 31, 2018	Nov. 30, 2017	Jun. 30, 2017	May 31, 2017	Mar. 31, 2017	Sep. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Debt repaid		$ 500,000,000		$ 375,000,000		$ 250,000,000
Principal amount					$ 600,000,000
Payments of debt issuance costs					3,000,000
Proceeds from issuance of long-term debt					605,000,000					$ 1,491,000,000	$ 1,500,000,000	$ 1,099,000,000
Interest and debt expense										170,000,000	125,000,000	78,000,000
Interest paid										$ 156,000,000	$ 114,000,000	$ 75,000,000
Notes due 2019 at 1.65%
Debt Instrument [Line Items]
Debt repaid	$ 750,000,000
Long-term debt stated interest rate (in percentage)										1.65%
Notes due 2039 at 3.875%
Debt Instrument [Line Items]
Principal amount								$ 750,000,000
Payments of debt issuance costs								7,000,000
Proceeds from issuance of long-term debt								$ 743,000,000
Long-term debt stated interest rate (in percentage)										3.875%
Notes due 2029 at 2.25%
Debt Instrument [Line Items]
Principal amount							$ 750,000,000
Payments of debt issuance costs							5,000,000
Proceeds from issuance of long-term debt							$ 748,000,000
Long-term debt stated interest rate (in percentage)										2.25%
Notes due 2048 at 4.15%
Debt Instrument [Line Items]
Principal amount									$ 1,500,000,000
Payments of debt issuance costs									16,000,000
Proceeds from issuance of long-term debt									1,500,000,000
Long-term debt stated interest rate (in percentage)										4.15%
4.15% Notes issued in May 2018
Debt Instrument [Line Items]
Principal amount		$ 1,300,000,000
4.15% Notes issued in June 2018
Debt Instrument [Line Items]
Principal amount									$ 200,000,000
Notes due 2021 at 2.75%
Debt Instrument [Line Items]
Principal amount					$ 300,000,000
Long-term debt stated interest rate (in percentage)					2.75%					2.75%
Notes due 2024 at 2.625%
Debt Instrument [Line Items]
Principal amount					$ 300,000,000
Long-term debt stated interest rate (in percentage)					2.625%					2.625%
Notes due 2027 at 2.90%
Debt Instrument [Line Items]
Principal amount			$ 500,000,000
Payments of debt issuance costs			3,000,000
Proceeds from issuance of long-term debt			$ 494,000,000
Long-term debt stated interest rate (in percentage)										2.90%
Revolving credit facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity										$ 2,000,000,000