Debt and Banking Arrangements (Tables)

3 Months Ended

Mar. 31, 2020

Debt Disclosure [Abstract]

Schedule of Line of Credit Facilities [Table Text Block]

Credit Facilities

	March 31, 2020
	Stated Capacity		Outstanding
	(Millions)
Long-term credit facility (1)	$	4,500	$	1,700
Letters of credit under certain bilateral bank agreements			14

(1)

In managing our available liquidity, we do not expect a maximum outstanding amount in excess of the capacity of our credit facility inclusive of any outstanding amounts under our commercial paper program.