Debt Instrument, Covenant Requirement, Leverage Ratio, Maximum

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- Definition

Line Of Credit Facility, Unrestricted Cash Included As Part Of Total Leverage Ratio

+ References

No definition available.

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

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

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- Definition

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.

+ References

No definition available.

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

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

+ References

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- Definition

The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt.

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Long-term debt - Narrative (Detail)					12 Months Ended
Long-term debt - Narrative (Detail)	Jan. 09, 2020 USD ($)	Oct. 18, 2019 USD ($)	Oct. 15, 2019 USD ($)	Aug. 15, 2019 USD ($)	Dec. 31, 2019 USD ($)	Sep. 13, 2019 USD ($)	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Increase in amount of unrestricted cash allowed to offset debt					$ 500,000,000.0
Senior Notes issued					$ 4,203,000,000		$ 2,960,000,000
Unsecured notes bearing fixed rate interest at 5.00% due September 2029
Debt Instrument [Line Items]
Interest rate stated percentage					5.00%
Senior Notes issued					$ 1,100,000,000	$ 1,100,000,000	0
Unsecured notes bearing fixed rate interest at 5.125% paid October 2019
Debt Instrument [Line Items]
Interest rate stated percentage					5.125%
Senior Notes issued					$ 0		320,000,000
Unsecured notes bearing fixed rate interest at 5.125% due July 2020
Debt Instrument [Line Items]
Interest rate stated percentage					5.125%
Senior Notes issued					$ 310,000,000		600,000,000
Unsecured notes bearing fixed rate interest at 6.375% due October 2023
Debt Instrument [Line Items]
Interest rate stated percentage					6.375%
Senior Notes issued					$ 650,000,000		$ 650,000,000
Line of Credit \| Unsecured notes bearing fixed rate interest at 5.125% paid October 2019
Debt Instrument [Line Items]
Interest rate stated percentage			5.125%
Repayments of unsecured debt			$ 320,000,000.0
Line of Credit \| Unsecured notes bearing fixed rate interest at 5.125% due July 2020
Debt Instrument [Line Items]
Interest rate stated percentage		5.125%
Repayments of unsecured debt		$ 290,000,000.0
Senior Notes issued					600,000,000.0
Unsecured Debt \| Unsecured notes bearing fixed rate interest at 5.00% due September 2029
Debt Instrument [Line Items]
Debt instrument, face amount						$ 1,100,000,000
Interest rate stated percentage						5.00%
Revolving Credit Facility \| Line of Credit
Debt Instrument [Line Items]
Unused borrowing capacity					$ 594,800,000
Revolving Credit Facility \| Line of Credit \| Amended and Restated Competitive Advance and Revolving Credit Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 1,510,000,000
July 1, 2019 - September 30, 2020 \| Amended and Restated Competitive Advance and Revolving Credit Agreement
Debt Instrument [Line Items]
Covenant requirement, maximum total leverage ratio				5.50
October 1, 2020 - March 31, 2021 \| Amended and Restated Competitive Advance and Revolving Credit Agreement
Debt Instrument [Line Items]
Covenant requirement, maximum total leverage ratio				5.25
April 1, 2021 - September 30, 2021 \| Amended and Restated Competitive Advance and Revolving Credit Agreement
Debt Instrument [Line Items]
Covenant requirement, maximum total leverage ratio				5.00
October 1, 2021 - September 30, 2022 \| Amended and Restated Competitive Advance and Revolving Credit Agreement
Debt Instrument [Line Items]
Covenant requirement, maximum total leverage ratio				4.75
October 1, 2022 and thereafter \| Amended and Restated Competitive Advance and Revolving Credit Agreement
Debt Instrument [Line Items]
Covenant requirement, maximum total leverage ratio				4.50
Subsequent Event \| Unsecured notes bearing fixed rate interest at 5.125% due July 2020
Debt Instrument [Line Items]
Interest rate stated percentage	5.125%
Repayments of unsecured debt	$ 310,000,000.0
Subsequent Event \| Senior Notes Bearing Interest at 4.625 Percent Due March 2028
Debt Instrument [Line Items]
Interest rate stated percentage	4.625%
Subsequent Event \| Unsecured notes bearing fixed rate interest at 6.375% due October 2023
Debt Instrument [Line Items]
Interest rate stated percentage	6.375%
Repayments of unsecured debt	$ 650,000,000.0
Subsequent Event \| Senior Notes \| Senior Notes Bearing Interest at 4.625 Percent Due March 2028
Debt Instrument [Line Items]
Debt instrument, face amount	$ 1,000,000,000.0
Federal Funds Rate \| Revolving Credit Facility \| Line of Credit \| Amended and Restated Competitive Advance and Revolving Credit Agreement
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					0.50%
LIBOR \| Revolving Credit Facility \| Line of Credit \| Amended and Restated Competitive Advance and Revolving Credit Agreement
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					1.00%