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Contingencies And Commitments (Finance Lease Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Contingencies And Commitments [Abstract]
Amortization of ROU assets	$ 53	$ 67
Interest on lease liabilities	6	13
Total	$ 59	$ 80

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Amount of interest expense on finance lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
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Amount of amortization expense attributable to right-of-use asset from finance lease.

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