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Other Income and Expense - Other Expense (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 expense [Line Items]        
Gain (Loss) on Disposition of Assets     $ 37 $ (21)
Other Nonoperating Expense $ 0 $ 0 202 0
Other Expenses 20 9 27 35
Other Expense [Member]        
Schedule of other expense [Line Items]        
Gain (Loss) Related to Litigation Settlement 12 0 14 1
Gain (Loss) on Disposition of Assets 4 5 6 19
Defined Benefit Plan, Other Cost (Credit) 0 4 1 13
Other Nonoperating Expense 4 0 6 2
Other Expenses $ 20 $ 9 $ 27 $ 35