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Short-Term Debt (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Short-Term Debt Credit Facilities

Credit Facilities

		December 31, 2017												December 31, 2016
										Letters												Letters
		Credit				Borrowings				of Credit				Credit				Borrowings				of Credit
(millions)		Facilities				Outstanding ⁽¹⁾				Outstanding				Facilities				Outstanding ⁽¹⁾				Outstanding
5-year facility ⁽²⁾		$	325			$	5			$	1			$	325			$	40			$	1
3-year accounts receivable facility ⁽³⁾			150				0				0				150				130				0
1-year term facility ⁽⁴⁾			300				300				0				0				0				0
Total		$	775			$	305			$	1			$	475			$	170			$	1

(1)	Borrowings outstanding are reported as notes payable.

(2)	This 5-year facility matures March 22, 2022.

(3)	This 3-year facility matures March 23, 2018.

(4)	This 1-year facility matures on November 1, 2018.