Investments and Restricted Cash and Investments (Tables)

12 Months Ended

Dec. 31, 2017

Investments, Including Equity Method And Restricted Cash And Investments [Line Items]

Investments and Restricted Cash and Investments [Table Text Block]

Investments and restricted cash and investments consists of the following as of December 31 (in millions):

	2017		2016
Investments:
BYD Company Limited common stock	$	1,961	$	1,185
Rabbi trusts	441		403
Other	124		106
Total investments	2,526		1,694
Equity method investments:
Tax equity investments	1,025		741
Electric Transmission Texas, LLC	524		672
Bridger Coal Company	137		165
Other	148		142
Total equity method investments	1,834		1,720
Restricted cash and investments:
Quad Cities Station nuclear decommissioning trust funds	515		460
Other	348		282
Total restricted cash and investments	863		742
Total investments and restricted cash and investments	$	5,223	$	4,156
Reflected as:
Current assets	$	351	$	211
Noncurrent assets	4,872		3,945
Total investments and restricted cash and investments	$	5,223	$	4,156

MidAmerican Energy Company [Member]

Investments, Including Equity Method And Restricted Cash And Investments [Line Items]

Investments and Restricted Cash and Investments [Table Text Block]

Investments and restricted cash and investments consists of the following amounts as of December 31 (in millions):

	2017		2016
Nuclear decommissioning trust	$	515	$	460
Rabbi trusts	198		184
Other	15		9
Total	$	728	$	653