Membership Interests (Tables)	12 Months Ended
	Dec. 31, 2021
Membership Interests [Abstract]
Schedule Of Cash Capital Contributions	Receipt Date AmountFebruary 16, 2021 $ 63April 27, 2021 $ 63July 27, 2021 $ 62October 26, 2021 $ 67December 22, 2021 $ 450
Schedule Of Distributions Paid	Declaration Date Payment Date AmountFebruary 17, 2021 February 18, 2021 $ 96April 28, 2021 April 29, 2021 $ 96July 28, 2021 July 29, 2021 $ 546October 27, 2021 October 28, 2021 $ 101
Schedule Of Changes To Accumulated Other Comprehensive Income (Loss)	Cash Flow Hedges – Interest Rate Swap Defined Benefit Pension and OPEB Plans Accumulated Other Comprehensive Income (Loss) Balance at December 31, 2018 $ (16) $ (148) $ (164)Defined benefit pension plans - 27 27Cash flow hedge amounts reclassified from AOCI and reported in interest expense and related charges (net of tax expense $-) 2 - 2Amounts reclassified from accumulated other comprehensive income (loss) to capital account (4) - (4)Balance at December 31, 2019 $ (18) $ (121) $ (139)Defined benefit pension plans - 9 9Cash flow hedges — net decrease in fair value of derivatives (net of tax benefit of $6) (24) - (24)Cash flow hedge amounts reclassified from AOCI and reported in interest expense and related charges (net of tax expense $1) 3 - 3Balance at December 31, 2020 $ (39) $ (112) $ (151)Defined benefit pension plans - 17 17Cash flow hedge amounts reclassified from AOCI and reported in interest expense and related charges (net of tax expense $-) 3 - 3Balance at December 31, 2021 $ (36) $ (95) $ (131)