Accumulated Other Comprehensive Income (Loss), Net of Tax (Reclassifications of AOCI) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Less: Loss Reclassified into Income	$ (7)	$ (3)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax	2	1
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(5)	(2)
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)		$ (4)
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	0	(5)
Reclassification Adjustment from AOCI, Pension and OPEB, Tax	0	2
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax	0	(3)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	0	(3)
Available-for-Sale Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification for Available for Sale Securities, Pre-Tax	(6)	3
Reclassification for Available for Sale Securities, Tax	2	(1)
Reclassification for Available for Sale Securities, After-Tax	(4)	2
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(4)	2
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	5	5
Amortization of Prior Service (Cost) Credit, Tax	(1)	(1)
Amortization of Prior Service (Cost) Credit, After-Tax	4	4
Amortization of Actuarial Loss, Pre-Tax	(5)	(10)
Amortization of Actuarial Loss, Tax	1	3
Amortization of Actuarial Loss, After-Tax	(4)	(7)
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	(6)	3
Reclassification for Available for Sale Securities, Tax	2	(1)
Reclassification for Available for Sale Securities, After-Tax	$ (4)	$ 2

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