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Leases (Narrative) (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2020	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases Disclosure [Line Items]
Property, plant and equipment	$ 57,848		$ 59,774	$ 57,848
Accumulated depreciation, depletion and amortization	$ 25,111		26,729	25,111
Agreement with Lessor to Complete Construction and Lease Jones Act Compliant Offshore Wind Installation Vessel
Leases Disclosure [Line Items]
Requested cash draws from lessor to fund project costs			293
Required percentage payment for specific full recourse events	100.00%
Lease maturity term	2027-11
Lessor | Agreement with Lessor to Complete Construction and Lease Jones Act Compliant Offshore Wind Installation Vessel
Leases Disclosure [Line Items]
Amount of financing commitments to fund estimated project costs	$ 550			550
Lessor | New Corporate Office | Agreement with Lessor to Construct and Lease Corporate Office Property
Leases Disclosure [Line Items]
Amount of financing commitments to fund estimated project costs					$ 465
Leasing arrangement, charge			62
Leasing arrangement, charge after tax			46
Lease effective termination date		2021-04
Power Purchase Arrangement [Member]
Leases Disclosure [Line Items]
Property, plant and equipment	2,200		1,200	2,200
Accumulated depreciation, depletion and amortization	$ 68		106	68
Rental revenue			168	175	174
Depreciation expense			$ 110	$ 102	$ 94

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