Contingencies (Schedule of Reconciliation of the Beginning and Ending Liability Balances in Connection with Probable Contingencies) (Details) - Pending Litigation [Member] - Other Probable Contingencies [Member] $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Loss Contingency Accrual [Roll Forward]
Beginning Balance	$ 19
Expense	3
Reserve for insured claim
Cash payments	(5)
Ending Balance	$ 17