v3.26.1
Segment Information - MidAmerican Funding (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2026
USD ($)
segment
operatingSegment
Mar. 31, 2025
USD ($)
Dec. 31, 2025
USD ($)
Segment Reporting Information [Line Items]      
Number of reportable segments | operatingSegment 8    
Revenues $ 6,672 $ 6,366  
Cost of sales 1,670 1,531  
Operating income 1,458 1,383  
Interest expense (746) (686)  
Interest and dividend income 54 62  
Income tax expense (benefit) (430) (399)  
Other segment items (191) (82)  
Net income (loss) attributable to parent 1,114 1,187  
Capital expenditures 2,418 2,128  
Assets 152,029   $ 148,327
Goodwill $ 11,400   11,521
MidAmerican Funding, LLC      
Segment Reporting Information [Line Items]      
Number of reportable segments | segment 2    
Revenues $ 1,140 1,014  
Cost of sales 484 369  
Operations and maintenance 220 227  
Depreciation and amortization 277 307  
Property and other taxes 48 44  
Operating income 111 67  
Interest expense (109) (105)  
Interest and dividend income 6 7  
Income tax expense (benefit) (218) (236)  
Other segment items 19 23  
Net income (loss) attributable to parent 245 228  
Capital expenditures 418 405  
Assets 29,066   28,918
Goodwill 1,270   1,270
MidAmerican Funding, LLC | Other      
Segment Reporting Information [Line Items]      
Revenues 3 2  
Cost of sales 0 0  
Operations and maintenance 0 1  
Depreciation and amortization 0 0  
Property and other taxes 0 0  
Operating income 3 1  
Interest expense (4) (4)  
Interest and dividend income 0 0  
Income tax expense (benefit) (1) 0  
Other segment items (1) (1)  
Net income (loss) attributable to parent (1) (4)  
Capital expenditures 0 0  
Assets 12   8
MidAmerican Funding, LLC | Electric | Operating segments      
Segment Reporting Information [Line Items]      
Revenues 747 667  
Cost of sales 194 124  
Operations and maintenance 181 193  
Depreciation and amortization 259 290  
Property and other taxes 43 40  
Operating income 70 20  
Interest expense (96) (93)  
Interest and dividend income 5 6  
Income tax expense (benefit) (224) (246)  
Other segment items 23 23  
Net income (loss) attributable to parent 226 202  
Capital expenditures 394 374  
Assets 26,883   26,686
Goodwill 1,191   1,191
MidAmerican Funding, LLC | Natural Gas | Operating segments      
Segment Reporting Information [Line Items]      
Revenues 390 345  
Cost of sales 290 245  
Operations and maintenance 39 33  
Depreciation and amortization 18 17  
Property and other taxes 5 4  
Operating income 38 46  
Interest expense (9) (8)  
Interest and dividend income 1 1  
Income tax expense (benefit) 7 10  
Other segment items (3) 1  
Net income (loss) attributable to parent 20 30  
Capital expenditures 24 $ 31  
Assets 2,171   2,224
Goodwill $ 79   $ 79