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Long-term debt - Narrative (Detail) |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
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% |  |

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