Contingencies And Commitments (Future Minimum Lease Payments) (Details) $ in Millions	Sep. 30, 2019 USD ($)
Operating Leases
Remainder of 2019	$ 11
2020	43
2021	43
2022	38
2023	36
Thereafter	70
Total future minimum lease payments	241
Less: Amount representing interest	30
Present value of minimum lease payments	211
Finance Leases
Remainder of 2019	85
2020	57
2021	67
2022	68
2023	94
Thereafter	30
Total future minimum lease payments	401
Less: Amount representing interest	37
Present value of minimum lease payments	$ 364