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Acquisitions (Scientific Management Associates (Operations) Pty Ltd) (Details) - USD ($) $ in Millions		3 Months Ended
	Mar. 06, 2020	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Goodwill			$ 2,060	$ 1,761	$ 1,265
SMA
Business Acquisition [Line Items]
Purchase price of acquisition	$ 13
Hold-backs to be settled and other adjustments	4
Cash consideration paid	9
Goodwill	$ 12
Payment of contingent consideration liability		$ 1

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Business Combination, Consideration Transferred, Hold-backs To Be Settled And Other Adjustments

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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