Contingencies and Commitments - Loss Contingencies (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Environmental Contingencies
Liability recorded for projected environmental remediation costs	$ 4	$ 4
Litigation [Member]
Litigation Contingencies
Aggregate reserves for claims deemed both probable and reasonably estimable	14	$ 55
Maximum [Member]
Litigation Contingencies
Loss Contingency, Estimate of Possible Loss ( Equal to or less than)	11
Maximum [Member] | Litigation [Member]
Litigation Contingencies
Loss Contingency, Estimate of Possible Loss ( Equal to or less than)	481
Minimum [Member] | Litigation [Member]
Litigation Contingencies
Loss Contingency, Estimate of Possible Loss ( Equal to or less than)	$ 241