Contingencies And Commitments (Future Minimum Lease Payments) (Details) $ in Millions	Jun. 30, 2019 USD ($)
Operating Leases
Remainder of 2019	$ 21
2020	39
2021	38
2022	33
2023	30
Thereafter	67
Total future minimum lease payments	228
Less: Amount representing interest	30
Present value of minimum lease payments	198
Finance Leases
Remainder of 2019	90
2020	58
2021	67
2022	67
2023	91
Thereafter	28
Total future minimum lease payments	401
Less: Amount representing interest	37
Present value of minimum lease payments	$ 364