Accumulated Other Comprehensive Income (Loss), Net of Tax (Reclassifications of AOCI) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Less: Loss Reclassified into Income	$ (16)	$ (7)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax	6	2
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(10)	(5)
Cash Flow Hedges [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cash Flow Hedge, Pre-tax	(1)	(1)
Cash Flow Hedge, Tax	0	0
Cash Flow Hedge, After Tax	(1)	(1)
Less: Loss Reclassified into Income	(1)		$ (5)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(1)	(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)	0
Reclassification Adjustment from AOCI, Pension and OPEB, Tax	2	0
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax	(3)	0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(3)	0
Available-for-Sale Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification for Available for Sale Securities, Pre-Tax	(10)	(6)
Reclassification for Available for Sale Securities, Tax	4	2
Reclassification for Available for Sale Securities, After-Tax	(6)	(4)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(6)	(4)
Interest Expense [Member] \| Cash Flow Hedges [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cash Flow Hedge, Pre-tax	(1)	(1)
Cash Flow Hedge, Tax	0	0
Cash Flow Hedge, After Tax	(1)	(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
Amortization of Prior Service (Cost) Credit, Tax	0	(1)
Amortization of Prior Service (Cost) Credit, After-Tax	2	4
Amortization of Actuarial Loss, Pre-Tax	(7)	(5)
Amortization of Actuarial Loss, Tax	2	1
Amortization of Actuarial Loss, After-Tax	(5)	(4)
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	(10)	(6)
Reclassification for Available for Sale Securities, Tax	4	2
Reclassification for Available for Sale Securities, After-Tax	$ (6)	$ (4)

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-URI https://asc.fasb.org/extlink&oid=124431353&loc=SL124442407-227067

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