Segment Information - Narrative (Details) $ in Millions	3 Months Ended
Mar. 31, 2024 USD ($) segment line	Mar. 31, 2023 USD ($)
Revenue from External Customer [Line Items]
Number of primary lines of business \| line	1
Number of reportable segments \| segment	3
Revenues	$ 2,127	$ 1,998
UNITED STATES
Revenue from External Customer [Line Items]
Revenues	795	$ 753
UNITED KINGDOM
Revenue from External Customer [Line Items]
Revenues	$ 218

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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+ Details