Accumulated Other Comprehensive Income (Loss), Net of Tax (Reclassifications of AOCI) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	$ (11)	$ (14)	$ (27)	$ (21)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax	4	6	10	8
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(7)	(8)	(17)	(13)
Cash Flow Hedges [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cash Flow Hedge, Pre-tax	1	(1)	0	(2)
Cash Flow Hedge, Tax	0	(1)	0	(1)
Cash Flow Hedge, After Tax	1	0	0	(1)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax			0		$ 5
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	1	0	0	(1)	$ 3
Pension and OPEB Plans [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification Adjustment from AOCI, Pension and OPEB, Pre-Tax	(5)	(1)	(10)	(1)
Reclassification Adjustment from AOCI, Pension and OPEB, Tax	1	0	3	0
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax	(4)	(1)	(7)	(1)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(4)	(1)	(7)	(1)
Available-for-Sale Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification for Available for Sale Securities, Pre-Tax	(7)	(12)	(17)	(18)
Reclassification for Available for Sale Securities, Tax	3	5	7	7
Reclassification for Available for Sale Securities, After-Tax	(4)	(7)	(10)	(11)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(4)	(7)	(10)	(11)
Interest Expense [Member] \| Cash Flow Hedges [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cash Flow Hedge, Pre-tax	1	(1)	0	(2)
Cash Flow Hedge, Tax	0	1	0	1
Cash Flow Hedge, After Tax	1	0	0	(1)
Non-Operating Pension and OPEB Credits (Costs) [Member] \| Pension and OPEB Plans [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amortization of Prior Service (Cost) Credit, Pre-Tax	2	5	4	10
Amortization of Prior Service (Cost) Credit, Tax	(1)	(2)	(1)	(3)
Amortization of Prior Service (Cost) Credit, After-Tax	1	3	3	7
Amortization of Actuarial Loss, Pre-Tax	(7)	(6)	(14)	(11)
Amortization of Actuarial Loss, Tax	2	2	4	3
Amortization of Actuarial Loss, After-Tax	(5)	(4)	(10)	(8)
Net Gains (Losses) on Trust Investments [Member] \| Available-for-Sale Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification for Available for Sale Securities, Pre-Tax	(7)	(12)	(17)	(18)
Reclassification for Available for Sale Securities, Tax	3	5	7	7
Reclassification for Available for Sale Securities, After-Tax	$ (4)	$ (7)	$ (10)	$ (11)

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