Contingencies And Commitments (Future Minimum Lease Payments) (Details) $ in Millions	Dec. 31, 2019 USD ($)
Operating Leases
2020	$ 49
2021	48
2022	44
2023	42
2024	28
Thereafter	67
Total future minimum lease payments	278
Less: Amount representing interest	38
Present value of minimum lease payments	240
Finance Leases
2020	56
2021	66
2022	66
2023	90
2024	17
Thereafter	12
Total future minimum lease payments	307
Less: Amount representing interest	26
Present value of minimum lease payments	$ 281