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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |  |
Impairment of goodwill, intangibles and other assets | $ 0 | $ 2 | $ 1,500 | $ 0 | $ 1,482
Sale of accounts receivable | 450 |  |  |  |
Increase in sale of accounts receivable |  |  |  | $ 100 |
Acquisition of noncontrolling interests (investing) | $ 22 |  |  |  |
Learning and Development |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gain (loss) on disposition of business |  | $ (8) |  |  | $ (8)

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