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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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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
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Principal amount of long-term debt and capital lease obligation maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Principal amount of long-term debt and capital lease obligation maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Principal amount of long-term debt and capital lease obligation maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Principal amount of long-term debt and capital lease obligation maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Principal amount of long-term debt and capital lease obligation maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Principal amount of long-term debt and capital lease obligation maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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The fair value of notes issued in noncash investing and financing activities.

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The cash outflow for the payment of a long-term borrowing made from a related party where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Payments for Advances from Affiliates.

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The amount of debt refunded and reissued.

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