Other Income and Expense - Other Income (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2019		Sep. 30, 2018	Sep. 30, 2019		Sep. 30, 2018
Schedule of Other Nonoperating Income [Line Items]
Other income	$ 78		$ 10	$ 126		$ 30
Other Income [Member]
Schedule of Other Nonoperating Income [Line Items]
Gain on insurance proceeds (1)	73	[1]	0	108	[1]	0
Allowance for funds used during construction (US Utilities)	1		1	3		8
Other income	4		9	15		22
Other Nonoperating Income	$ 78		$ 10	$ 126		$ 30

[1] ⁽¹⁾   Associated with recoveries for property damage at the Andres facility in the Dominican Republic from a lightning incident in September 2018 and the upgrade of the tunnel lining at Changuinola.