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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)