Goodwill and Other Intangible Assets, Net - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2017
Finite-Lived Intangible Assets [Line Items]
State income tax receivable overstated amount				$ 9		$ 20
Asset impairment charges		$ 1,500	$ 1,503	1,223	$ 8,337
Impairment of acquired intangible assets		$ 1,300	1,279	1,053
Continuing Operations
Finite-Lived Intangible Assets [Line Items]
Gain (loss) on disposition of business and asset impairments				(3)
Gain (loss) on disposition of business and asset impairments, net of taxes				(2)
Amortization expense for intangible assets			157	192	189
Discontinued Operations
Finite-Lived Intangible Assets [Line Items]
Gain (loss) on disposition of business and asset impairments				(8)
Gain (loss) on disposition of business and asset impairments, net of taxes				(6)
Amortization expense for intangible assets			0	0	$ 43
Commercial Solutions
Finite-Lived Intangible Assets [Line Items]
Impairment of acquired intangible assets			320	152
Commercial Solutions | Mapa/Spontex and Quickie
Finite-Lived Intangible Assets [Line Items]
Asset impairment charges				158
Learning and Development
Finite-Lived Intangible Assets [Line Items]
Goodwill allocated to loss on disposal of business	$ 3
Impairment of acquired intangible assets			$ 100	24
Commercial
Finite-Lived Intangible Assets [Line Items]
Amortization expense for intangible assets				$ 7