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Debt (Details) CAD in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 USD ($) credit_facility | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) credit_facility program | Jun. 30, 2016 USD ($) | Jun. 30, 2017 CAD credit_facility | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Short-term debt and current portion of long-term debt | $ 292,000,000 |  | $ 292,000,000 |  |  | $ 336,000,000
Number of credit facilities | credit_facility | 1 |  | 1 |  | 1 |
Number of commercial paper programs | program |  |  | 2 |  |  |
Commercial paper |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt | $ 0 |  | $ 0 |  |  | $ 329,000,000
Weighted average commercial paper outstanding | $ 318,000,000 | $ 304,000,000 | $ 342,000,000 | $ 240,000,000 |  |
Weighted-average interest rates (as a percent) | 0.26% | 0.59% | 0.18% | 0.41% |  |
4.76% Senior Notes Due March 2018 | Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Short-term debt and current portion of long-term debt | $ 283,000,000 |  | $ 283,000,000 |  | CAD 375 |
Debt interest rate percentage (as a percent) | 4.76% |  | 4.76% |  | 4.76% |
Credit Facility Expiring February 2021 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term line of credit | $ 0 |  | $ 0 |  |  |
Foreign Line of Credit | 2020 Facility | Line of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | 900,000,000 |  | 900,000,000 |  |  |
Credit Facility Expiring March 2017 | Line of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | 400,000,000 |  | 400,000,000 |  |  |
Commercial paper | Commercial Paper Programs |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | 1,300,000,000 |  | 1,300,000,000 |  |  |
Line of credit facility, current borrowing capacity | $ 900,000,000 |  | $ 900,000,000 |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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