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Short-Term Debt (Tables)

12 Months Ended

Dec. 31, 2019

Debt Disclosure [Abstract]

Short-Term Debt Credit Facilities

Credit Facilities

		December 31, 2019												December 31, 2018
										Letters												Letters
		Credit				Borrowings				of Credit				Credit				Borrowings				of Credit
(millions)		Facilities				Outstanding ⁽¹⁾				Outstanding				Facilities				Outstanding ⁽¹⁾				Outstanding
5-year facility ⁽²⁾		$	400			$	295			$	1			$	325			$	131			$	1
3-year accounts receivable facility ⁽³⁾			150				53				0				150				90				0
Total		$	550			$	348			$	1			$	475			$	221			$	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 22, 2021.