Employee Benefit Plans - MEC - Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Pension Plan [Member] | MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement		$ 1
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	$ 8	9	$ 9
Defined Benefit Plan, Interest Cost	27	24	29
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(40)	(41)	(40)
Defined Benefit Plan Net Amortization	(6)	(13)	(14)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(11)	(21)	(16)
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	5	5	5
Defined Benefit Plan, Interest Cost	10	8	9
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(13)	(13)	(14)
Defined Benefit Plan Net Amortization	(3)	(4)	(4)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(1)	(4)	(4)
Other Postretirement Benefits Plan [Member] | MidAmerican Energy Company [Member] | MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	1	(2)	(1)
UNITED STATES | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	16	21	24
Defined Benefit Plan, Interest Cost	111	105	116
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(154)	(164)	(160)
Defined Benefit Plan Net Amortization	31	28	25
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	4	11	5
UNITED STATES | Pension Plan [Member] | MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	6	9	9
Defined Benefit Plan, Interest Cost	30	28	31
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(41)	(44)	(44)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement		(1)
Defined Benefit Plan Net Amortization	1	2	2
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(4)	(6)	(2)
UNITED STATES | Pension Plan [Member] | MidAmerican Energy Company [Member] | MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ (8)	$ (9)	$ (6)