Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

Average fixed interest rate related to the group of interest rate derivatives.

+ References

No definition available.

+ Details

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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

Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

+ References

No definition available.

+ Details

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Derivatives and Hedging - Cash flow hedges (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Apr. 05, 2018
Derivatives and Hedging
Long-term debt at variable rate			$ 1,000
Average interest rate			2.56%
Interest rate swaps
Derivatives and Hedging
Notional amount	$ 1,000
Interest rate swaps \| Maximum
Derivatives and Hedging
Contract term	3 years 3 months 18 days
Purchase contracts settled in Canadian dollars \| U.S. dollar
Derivatives and Hedging
Notional amount	$ 70	$ 165
Purchase contracts settled in Canadian dollars \| U.S. dollar \| Maximum
Derivatives and Hedging
Contract term	1 year 9 months 18 days	2 years 9 months 18 days
Purchase contracts settled in Canadian dollars \| EURO
Derivatives and Hedging
Notional amount	$ 10	$ 16
Purchase contracts settled in Canadian dollars \| EURO \| Maximum
Derivatives and Hedging
Contract term	2 years 3 months 18 days	2 years 8 months 12 days
Purchase contracts settled in Canadian dollars \| GBP
Derivatives and Hedging
Notional amount	$ 3	$ 2
Purchase contracts settled in Canadian dollars \| GBP \| Maximum
Derivatives and Hedging
Contract term	6 months	1 year
Sales contracts settled in Canadian dollars \| EURO
Derivatives and Hedging
Notional amount	$ 194	$ 312
Sales contracts settled in Canadian dollars \| EURO \| Maximum
Derivatives and Hedging
Contract term	3 years 9 months 18 days	3 years
Sales contracts settled in Canadian dollars \| GBP
Derivatives and Hedging
Notional amount	$ 1	$ 2
Sales contracts settled in Canadian dollars \| GBP \| Maximum
Derivatives and Hedging
Contract term	7 months 6 days	1 year
Sales contracts settled in Canadian dollars \| Japanese Yen
Derivatives and Hedging
Notional amount	$ 35	$ 26
Sales contracts settled in Canadian dollars \| Japanese Yen \| Maximum
Derivatives and Hedging
Contract term	2 years 7 months 6 days	3 years 1 month 6 days
Purchase contracts settled in US dollars \| EURO
Derivatives and Hedging
Notional amount	$ 10	$ 32
Purchase contracts settled in US dollars \| EURO \| Maximum
Derivatives and Hedging
Contract term	3 months 18 days	1 year 3 months 18 days
Purchase contracts settled in US dollars \| Japanese Yen
Derivatives and Hedging
Notional amount	$ 177	$ 2,231
Purchase contracts settled in US dollars \| Japanese Yen \| Maximum
Derivatives and Hedging
Contract term	2 months 12 days	1 year 2 months 12 days
Sales contracts settled in United States dollars \| EURO
Derivatives and Hedging
Notional amount	$ 20	$ 58
Sales contracts settled in United States dollars \| EURO \| Maximum
Derivatives and Hedging
Contract term	6 months	1 year 3 months 18 days
Sales contracts settled in United States dollars \| Japanese Yen
Derivatives and Hedging
Notional amount	$ 177	$ 1,116
Sales contracts settled in United States dollars \| Japanese Yen \| Maximum
Derivatives and Hedging
Contract term	2 months 12 days	1 year 2 months 12 days