Supplementary Financial Information (Schedule Of Operating Lease, Third Party Joint Project And Other Obligations) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Supplementary Financial Information [Abstract]
Operating lease liabilities (Notes 1 and 7)	$ 133	$ 124
Investment tax credits	4	5
Third party joint project obligation (Note 3)		100
Customer deposits - noncurrent	30
Other	64	76
Total operating lease, third party joint project and other obligations	$ 231	$ 305

Portion of the carrying amount as of the balance sheet date of obligations due all related parties that is payable after one year or beyond the normal operating cycle if longer.

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+ Details