Summary of Significant Accounting Policies - EEGH - Narrative (Details) $ in Millions	12 Months Ended
Dec. 31, 2021 USD ($) operatingSegment	Dec. 31, 2020 USD ($)
Disaggregation of Revenue [Line Items]
Unbilled revenue	$ 718	$ 750
Number of reportable segments \| operatingSegment	8
EEGH
Disaggregation of Revenue [Line Items]
Unbilled revenue	$ 36	95
Contract assets	19	29
Contract liabilities	$ 18	$ 19
Number of reportable segments \| operatingSegment	1

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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