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Employee Benefit Plans - BHE (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Other Postretirement Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 4 $ 4 $ 6 $ 6
Interest cost 5 5 10 10
Expected return on plan assets (7) (6) (14) (11)
Net amortization (1) (1) (1) (2)
Net periodic benefit cost (credit) 1 2 1 3
U.S. | Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 6 8 13 15
Interest cost 19 18 38 38
Expected return on plan assets (27) (36) (54) (69)
Settlement 0 0 2 0
Net amortization 5 7 9 13
Net periodic benefit cost (credit) 3 (3) 8 (3)
United Kingdom | Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 3 4 7 8
Interest cost 9 7 19 15
Expected return on plan assets (23) (28) (48) (56)
Net amortization 6 14 12 28
Net periodic benefit cost (credit) $ (5) $ (3) $ (10) $ (5)