Summary of Significant Accounting Policies - EGTS - Narrative (Details) $ in Millions	12 Months Ended
Dec. 31, 2022 USD ($) operatingSegment	Dec. 31, 2021 USD ($)
Disaggregation of Revenue [Line Items]
Unbilled revenue	$ 828	$ 718
Number of reportable segments \| operatingSegment	8
EGTS
Disaggregation of Revenue [Line Items]
Unbilled revenue	$ 9	28
Contract assets	10	19
Contract liabilities	$ 9	$ 3
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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