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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Deferred tax liabilities:    
Property-related $ 10,065 $ 10,133
Pension 437 417
Investments in partnerships and joint ventures 2,238 2,019
Other 1,730 1,618
Total deferred tax liabilities 14,470 14,187
Deferred tax assets and valuation allowance:    
Decommissioning reserves 290 317
Net operating loss carryforwards 299 380
Tax credit carryforwards 3,859 3,406
ARO and accrued asset removal costs 347 368
Regulatory liabilities 1,380 1,335
Other 755 515
Valuation allowance (289) (285)
Net deferred tax assets 6,641 6,036
Net deferred income taxes 7,829 8,151
Deferred tax assets and liabilities included in the consolidated balance sheets [Abstract]    
Noncurrent other assets 191 210
Deferred income taxes - noncurrent liabilities (8,020) (8,361)
Net deferred income taxes (7,829) (8,151)
FPL[Member]    
Deferred tax liabilities:    
Property-related 6,791 6,394
Pension 394 374
Investments in partnerships and joint ventures 3 0
Other 672 685
Total deferred tax liabilities 7,860 7,453
Deferred tax assets and valuation allowance:    
Decommissioning reserves 290 286
Net operating loss carryforwards 2 2
Tax credit carryforwards 0 0
ARO and accrued asset removal costs 226 273
Regulatory liabilities 1,259 1,219
Other 293 258
Valuation allowance 0 0
Net deferred tax assets 2,070 2,038
Net deferred income taxes 5,790 5,415
Deferred tax assets and liabilities included in the consolidated balance sheets [Abstract]    
Noncurrent other assets 0 0
Deferred income taxes - noncurrent liabilities (5,790) (5,415)
Net deferred income taxes $ (5,790) $ (5,415)