Accumulated Other Comprehensive Income (Loss), Net of Tax (Reclassifications of AOCI) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Less: Loss Reclassified into Income	$ (15)	$ (2)	$ (36)	$ (10)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax	5	0	13	2
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(10)	(2)	(23)	(8)
Cash Flow Hedges [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cash Flow Hedge, Pre-tax	(1)	(1)	(3)	(3)
Cash Flow Hedge, Tax	0	0	(1)	(1)
Cash Flow Hedge, After Tax	(1)	(1)	(2)	(2)
Less: Loss Reclassified into Income			(3)		$ (4)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(1)	(1)	(2)	(2)	$ (3)
Pension and OPEB Plans [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification Adjustment from AOCI, Pension and OPEB, Pre-Tax	0	(5)	(1)	(15)
Reclassification Adjustment from AOCI, Pension and OPEB, Tax	0	1	0	4
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax	0	(4)	(1)	(11)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	0	(4)	(1)	(11)
Available-for-Sale Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification for Available for Sale Securities, Pre-Tax	(14)	4	(32)	8
Reclassification for Available for Sale Securities, Tax	5	(1)	12	(3)
Reclassification for Available for Sale Securities, After-Tax	(9)	3	(20)	5
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(9)	3	(20)	5
Interest Expense [Member] \| Cash Flow Hedges [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cash Flow Hedge, Pre-tax	(1)	(1)	(3)	(3)
Cash Flow Hedge, Tax	0	0	1	1
Cash Flow Hedge, After Tax	(1)	1	(2)	(2)
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	5	5	15	16
Amortization of Prior Service (Cost) Credit, Tax	(1)	(2)	(4)	(5)
Amortization of Prior Service (Cost) Credit, After-Tax	4	3	11	11
Amortization of Actuarial Loss, Pre-Tax	(5)	(10)	(16)	(31)
Amortization of Actuarial Loss, Tax	1	3	4	9
Amortization of Actuarial Loss, After-Tax	(4)	(7)	(12)	(22)
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	(14)	4	(32)	8
Reclassification for Available for Sale Securities, Tax	5	(1)	12	(3)
Reclassification for Available for Sale Securities, After-Tax	$ (9)	$ 3	$ (20)	$ 5

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