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Leases Lessor (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Lessor, Lease, Description [Line Items]    
Operating Lease, Right-of-Use Asset $ 275,000,000 $ 248,000,000
Sales-type Lease, Variable Lease Income 5,000,000  
Sales-type Lease, Interest Income 2,000,000  
Operating Lease, Lease Income 580,000,000 600,000,000
Lease Income 514,000,000 530,000,000
Variable Lease, Income 66,000,000 70,000,000
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment 8,472,000,000 8,505,000,000
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 3,000,000  
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Four Years 3,000,000  
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Five Years 3,000,000  
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Thereafter 39,000,000  
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received 52,000,000  
Sales-type and Direct Financing Leases, Lease Receivable, Undiscounted Excess Amount 24,000,000  
Sales-type and Direct Financing Leases, Lease Receivable 28,000,000  
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]    
Lessor, Operating Lease, Payments to be Received, Next Twelve Months 489,000,000  
Lessor, Operating Lease, Payments to be Received, Two Years 475,000,000  
Lessor, Operating Lease, Payments to be Received, Three Years 411,000,000  
Lessor, Operating Lease, Payments to be Received, Four Years 412,000,000  
Lessor, Operating Lease, Payments to be Received, Five Years 412,000,000  
Lessor, Operating Lease, Payments to be Received, Thereafter 1,034,000,000  
Lessor, Operating Lease, Payments to be Received 3,233,000,000  
Distributed Energy [Member]    
Lessor, Lease, Description [Line Items]    
Sales-type and Direct Financing Leases, Profit (Loss)   (36,000,000)
Property, Plant and Equipment [Member]    
Lessor, Lease, Description [Line Items]    
Operating Lease, Right-of-Use Asset 3,103,000,000 2,909,000,000
Assets    
Lessor, Lease, Description [Line Items]    
Operating Lease, Right-of-Use Asset 2,092,000,000 2,202,000,000
Accumulated Amortization on PP&E [Member]    
Lessor, Lease, Description [Line Items]    
Operating Lease, Right-of-Use Asset $ 1,011,000,000 $ 707,000,000