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Income Taxes - PAC - Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Deferred income tax assets:    
Regulatory liabilities $ 1,323 $ 1,349
AROs 283 304
Other 741 686
Total deferred income tax assets 3,159 3,159
Valuation allowances (187) (164)
Total deferred income tax assets, net 2,972 2,995
Deferred income tax liabilities:    
Property-related items (12,244) (11,814)
Regulatory assets (898) (764)
Other (510) (478)
Total deferred income tax liabilities (15,650) (15,933)
Net deferred income tax liability (12,678) (12,938)
PAC    
Deferred income tax assets:    
Regulatory liabilities 724 682
Employee benefits 59 68
State carryforwards 73 73
Loss contingencies 107 63
AROs 79 73
Other 80 88
Total deferred income tax assets 1,122 1,047
Valuation allowances (35) (15)
Total deferred income tax assets, net 1,087 1,032
Deferred income tax liabilities:    
Property-related items (3,612) (3,468)
Regulatory assets (462) (332)
Other (165) (79)
Total deferred income tax liabilities (4,239) (3,879)
Net deferred income tax liability $ (3,152) $ (2,847)