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Leases Lessor (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Lessor, Lease, Description [Line Items] |  |  |  |
Lease Income | $ 600,000,000 |  |  |
Variable Lease, Income | 130,000,000 |  |  |
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment | 8,505,000,000 |  | $ 8,227,000,000 |
Sales-type and Direct Financing Leases, Profit (Loss) | 36,000,000 | [1] | $ 0 | $ 0
Sales-type and Direct Financing Leases, Lease Receivable, Fiscal Year Maturity [Abstract] |  |  |  |
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Next Twelve Months | 2,000,000 |  |  |
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Two Years | 2,000,000 |  |  |
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Three Years | 2,000,000 |  |  |
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Four Years | 2,000,000 |  |  |
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Five Years | 2,000,000 |  |  |
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Thereafter | 38,000,000 |  |  |
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received | 48,000,000 |  |  |
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract] |  |  |  |
Lessor, Operating Lease, Payments to be Received, Next Twelve Months | 504,000,000 |  |  |
Lessor, Operating Lease, Payments to be Received, Two Years | 474,000,000 |  |  |
Lessor, Operating Lease, Payments to be Received, Three Years | 459,000,000 |  |  |
Lessor, Operating Lease, Payments to be Received, Four Years | 395,000,000 |  |  |
Lessor, Operating Lease, Payments to be Received, Five Years | 396,000,000 |  |  |
Lessor, Operating Lease, Payments to be Received, Thereafter | 1,463,000,000 |  |  |
Lessor, Operating Lease, Payments to be Received | 3,691,000,000 |  |  |
Sales-type and Direct Financing Leases, Lease Receivables, Gross Difference, Amount [Abstract] |  |  |  |
Sales-type and Direct Financing Leases, Lease Receivable, Undiscounted Excess Amount | 26,000,000 |  |  |
Sales-type and Direct Financing Leases, Lease Receivable | 22,000,000 |  |  |
Distributed Energy [Member] |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Sales-type and Direct Financing Leases, Profit (Loss) | (36,000,000) |  |  |
Property Subject to Operating Lease [Member] |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Property, Plant and Equipment, Gross | 2,900,000,000 |  |  |
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment | $ 707,000,000 |  |  |
[1] | Related to losses recognized at commencement of sales-type leases at Distributed Energy. See Note 14—Leases for further information.

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