Other Income and Expense - Other Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Schedule of other expense [Line Items]
Gain (Loss) on Disposition of Assets	$ 42	$ (7)
Other Nonoperating Expense	44	0
Other Expenses	4	12
Other Expense [Member]
Schedule of other expense [Line Items]
Gain (Loss) on Disposition of Assets	1	5
Defined Benefit Plan, Other Cost (Credit)	0	4
Other Nonoperating Expense	3	3
Other Expenses	$ 4	$ 12