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Leases Lessor (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Lessor Disclosure [Abstract]
Operating Lease, Lease Income	$ 193	$ 154	$ 454	$ 442
Variable Lease, Income	24	24	63	58
Lease Income	169	$ 130	391	$ 384
Sales-type and Direct Financing Leases, Lease Receivable, Fiscal Year Maturity [Abstract]
Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, after Year Five	336		336
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received	423		423
Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year Five	21		21
Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year Four	21		21
Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year Three	20		20
Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year Two	20		20
Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year One	5		5
Sales-type and Direct Financing Leases, Lease Receivables, Gross Difference, Amount [Abstract]
Sales-type and Direct Financing Leases, Lease Receivable	221		221
Sales-type and Direct Financing Leases, Lease Receivable, Undiscounted Excess Amount	(202)		(202)
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]
Lessor, Operating Lease, Payment to be Received, Year One	118		118
Lessor, Operating Lease, Payment to be Received, Year Two	465		465
Lessor, Operating Lease, Payment to be Received, Year Three	401		401
Lessor, Operating Lease, Payment to be Received, Year Four	402		402
Lessor, Operating Lease, Payment to be Received, Year Five	402		402
Lessor, Operating Lease, Payment to be Received, after Year Five	1,031		1,031
Lessor, Operating Lease, Payments to be Received	2,819		2,819
Operating Lease, Risk Strategy, Residual Asset	8,112		8,112		$ 8,472
Sales-type Lease, Interest Income	3		11
Property, Plant and Equipment [Member]
Lessor Disclosure [Abstract]
Operating Lease, Right-of-Use Asset	2,514		2,514		3,103
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]
Operating Lease, Right-of-Use Asset	2,514		2,514		3,103
Accumulated Amortization on PP&E
Lessor Disclosure [Abstract]
Operating Lease, Right-of-Use Asset	821		821		1,011
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]
Operating Lease, Right-of-Use Asset	821		821		1,011
Assets
Lessor Disclosure [Abstract]
Operating Lease, Right-of-Use Asset	1,693		1,693		2,092
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]
Operating Lease, Right-of-Use Asset	$ 1,693		1,693		$ 2,092
Distributed Energy [Member]
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]
Sales-type and Direct Financing Leases, Profit (Loss)			$ (13)

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount of lease income from operating, direct financing, and sales-type leases. Includes, but is not limited to, variable lease payments, interest income, profit (loss) recognized at commencement, and lease payments paid and payable to lessor.

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Amount of lease payment to be received by lessor for operating lease in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lease payment to be received by lessor for operating lease after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lease payment to be received by lessor for operating lease in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable.

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Present value of lease payments not yet received by lessor and amount expected to be derived from underlying asset, following end of lease term guaranteed by lessee or other third party unrelated to lessor, from sales-type and direct financing leases.

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