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Debt - Borrowings and Repayments (Detail) $ in Millions, $ in Millions |  | 1 Months Ended | 6 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 28, 2018 USD ($) | Mar. 31, 2016 CAD ($) | Mar. 31, 2016 USD ($) | Jun. 30, 2018 USD ($) | Aug. 31, 2018 CAD ($) | Aug. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Debt |  |  |  |  |  |  |  |  |
Net commercial paper borrowings |  |  |  |  |  |  | $ 453 | $ 513 |
Debt repayments |  |  |  |  |  |  | 499 | $ 1,907 | $ 2,682
Debt and capital lease principal payments in 2019 |  |  |  |  |  |  | 1,166 |  |
Debt and capital lease principal payments in 2020 |  |  |  |  |  |  | 780 |  |
Debt and capital lease principal payments in 2021 |  |  |  |  |  |  | 584 |  |
Debt and capital lease principal payments in 2022 |  |  |  |  |  |  | 622 |  |
Debt and capital lease principal payments in 2023 |  |  |  |  |  |  | 614 |  |
Debt and capital lease principal payments after 2023 |  |  |  |  |  |  | 6,382 |  |
Canadian Subsidiaries [Member] |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |
Repayments of intercompany debt |  | $ 370 |  |  |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |
Net line of credit proceeds (repayments) |  |  |  | $ 28 |  |  |  |  |
Commercial Paper Program [Member] |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |
Net commercial paper borrowings |  |  |  |  |  |  | 453 |  |
Canadian Term Loan [Member] |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |
Debt repayments |  |  |  |  | $ 142 | $ 109 |  |  |
Tax Exempt Bonds [Member] |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |
Debt repayments |  |  |  |  |  |  | 62 |  |
Debt instrument face amount |  |  |  |  |  |  | 80 |  |
Debt refunded and reissued |  |  |  |  |  |  | 105 |  |
Capital Leases and Other [Member] |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |
Capital obligations |  |  |  |  |  |  | 250 |  |
Net debt borrowings (repayments) |  |  |  |  |  |  | (60) |  |
Reduced obligation in divestitures |  |  |  |  |  |  | $ 50 |  |
Capital Leases and Other [Member] | Investments Qualifying for Federal Tax Credits [Member] |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |
Capital obligations | $ 139 |  |  |  |  |  |  |  |
Foreign Currency Derivatives [Member] |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |
Cash received derivative termination |  |  | $ 67 |  |  |  |  |  |
Derivative termination expense |  |  |  |  |  |  |  |  | $ 8

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