Employee Benefit Plans - 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
Pension Plan [Member] | UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Regulatory Deferrals, Before Tax	$ (1)	1
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, Accumulated Benefit Obligation, (Increase) Decrease for Settlement and Curtailment	0	21	0
Defined Benefit Plan Net Amortization	31	28	25
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	4	11	5
Pension Plan [Member] | UNITED STATES | 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)
Pension Plan [Member] | UNITED STATES | 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)
Pension Plan [Member] | UNITED KINGDOM
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	16	19	23
Defined Benefit Plan, Interest Cost	49	56	58
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(100)	(101)	(100)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	(26)	(44)	(31)
Defined Benefit Plan Net Amortization	46	45	63
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	37	63	75
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Regulatory Deferrals, Before Tax	(6)	(7)
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, Accumulated Benefit Obligation, (Increase) Decrease for Settlement and Curtailment	0	0	0
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)