Other Income and Expense - Other Income (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019		Sep. 30, 2020		Sep. 30, 2019
Schedule of Other Nonoperating Income [Line Items]
Other Nonoperating Income	$ 6	$ 78		$ 60		$ 126
Other Income [Member]
Schedule of Other Nonoperating Income [Line Items]
Gain on sale of assets (1)	0	0		43	[1]	0
Gain on insurance proceeds (2)	0	73	[2]	0		108	[2]
Other income	6	5		17		18
Other Nonoperating Income	$ 6	$ 78		$ 60		$ 126

[1] Primarily associated with the gain on sale of Redondo Beach land at Southland. See Note 18—Held-for-Sale and Dispositions for further information.

[2] 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.