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Leases (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
agreement
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Lessee, Lease, Description [Line Items]      
Number Of Land Use Agreements | agreement 3    
ROU assets, operating leases $ 535 $ 499  
Lease liabilities, operating leases 541 498  
ROU assets, finance leases 128 62  
Lease liabilities, finance leases $ 124 $ 56  
Weighted average incremental borrowing rate at the lease inception, operating leases 3.81% 3.73%  
Weighted average incremental borrowing rate at the lease inception, finance leases 3.50% 3.15%  
Weighted-average remaining lease term, operating leases 33 years 31 years  
Weighted-average remaining lease term, finance leases 25 years 14 years  
Expected lease payments over the remaining terms of the leases $ 1,200    
Operating Lease, Expense 95 $ 91  
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 121 450  
Net investment in sales-type leases 47 $ 50  
Losses at commencement of sales-type leases     $ (20)
Expected lease payments over the remaining terms of the power sales agreements $ 117    
Maximum [Member]      
Lessee, Lease, Description [Line Items]      
Lease extension term, operating lease 20 years