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Contingencies And Commitments (Future Minimum Lease Payments) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Operating Leases
2021	$ 51
2022	46
2023	43
2024	29
2025	22
Thereafter	47
Total future minimum lease payments	238
Less: Amount representing interest	44
Present value of minimum lease payments	194	$ 240
Finance Leases
2021	62
2022	72
2023	79
2024	17
2025	7
Thereafter	4
Total future minimum lease payments	241
Less: Amount representing interest	7
Present value of minimum lease payments	$ 234

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