Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Tax Credit Carryforward [Line Items]
Effective income tax rate	8.70%	5.70%
Tax adjustments, Settlements, and unusual provisions	$ 287
Unrecognized tax benefit	57	$ 38	$ 98	$ 132
Decrease in unrecognized tax benefits from resolutions of domestic foreign jurisdiction audit		4	60
Increase in unrecognized tax position from completion of audits of domestic and foreign jurisdictions from prior years	25	10	31
Income tax interest and penalties related to unrecognized tax benefit	2	0	$ 0
Accrued income tax interest and penalties related to unrecognized tax benefit	11	12
Foreign tax credit	404
Net operating loss carry forward	1,857
Tax-deductible goodwill		$ 118
Undistributed earnings subject to a permanent reinvestment assertion	0
Maximum [Member]
Tax Credit Carryforward [Line Items]
Period of amortization of goodwill		10 years
Carry Forward Expiration Year 2022 [Member]
Tax Credit Carryforward [Line Items]
Net operating loss carry forward	141
Carry Forward Expiration Year 2027 [Member]
Tax Credit Carryforward [Line Items]
Net operating loss carry forward	145
Carry Forward Expiration Year 2028 [Member]
Tax Credit Carryforward [Line Items]
Net operating loss carry forward	95
Carry Forward Expiration Year 2030 [Member]
Tax Credit Carryforward [Line Items]
Net operating loss carry forward	23
Cares Act [Member]
Tax Credit Carryforward [Line Items]
Tax adjustments, Settlements, and unusual provisions	$ 591