Investments and Restricted Cash and Cash Equivalents and Investments - BHE and EEGH - Reconciliation (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	$ 1,331	$ 1,290
Restricted cash and cash equivalents	154	140
Investments and restricted cash and cash equivalents and investments	15	15
Total cash and cash equivalents and restricted cash and cash equivalents	1,500	1,445	$ 2,070	$ 1,268
EEGH
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	86	35
Restricted cash and cash equivalents	11	13
Total cash and cash equivalents and restricted cash and cash equivalents	$ 97	$ 48	$ 64	$ 39