Contingencies And Commitments (Future Minimum Lease Payments) (Details) $ in Millions	Sep. 30, 2019 USD ($)
Operating Leases
Remainder of 2019	$ 9
2020	38
2021	35
2022	29
2023	27
Thereafter	68
Total future minimum lease payments	206
Less: Amount representing interest	27
Present value of minimum lease payments	179
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