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Acquisitions (Scientific Management Associates) (Details) - USD ($) $ in Millions		3 Months Ended
	Mar. 06, 2020	Mar. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Goodwill			$ 1,763	$ 1,761
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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- Definition

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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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of cash outflow, not made soon after acquisition date of business combination, to settle contingent consideration liability up to amount recognized at acquisition date, including, but not limited to, measurement period adjustment and less amount paid soon after acquisition date.

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