v3.20.4
Lease Pass-Through Financing Obligation - Additional Information (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Arrangement
Dec. 31, 2019
USD ($)
Property Subject To Or Available For Operating Lease [Line Items]    
Number of lease pass-through fund arrangements | Arrangement 8  
Cost of lease $ 3,540 $ 2,850
Accumulated depreciation on lease $ 446 406
Maximum [Member]    
Property Subject To Or Available For Operating Lease [Line Items]    
Initial lease term 25 years  
Solar Energy Systems Under Lease Pass-through Fund Arrangements [Member]    
Property Subject To Or Available For Operating Lease [Line Items]    
Cost of lease $ 1,050 1,050
Accumulated depreciation on lease 137 101
Capital lease obligation 68 94
Current portion of capital lease obligation $ 41 $ 57
Solar Energy Systems Under Lease Pass-through Fund Arrangements [Member] | Minimum [Member]    
Property Subject To Or Available For Operating Lease [Line Items]    
Initial lease term 10 years  
Solar Energy Systems Under Lease Pass-through Fund Arrangements [Member] | Maximum [Member]    
Property Subject To Or Available For Operating Lease [Line Items]    
Initial lease term 25 years