Other Balance Sheet and Statement of Operations Information - Additional Details Related to Certain Balance Sheet Captions (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Other current assets:
Prepaid taxes	$ 81	$ 94
Prepaid expenses	98	91
Capitalized costs to obtain and fulfill sales contracts	89	93
Foreign exchange forwards on certain assets and liabilities	0	31
Derivative instruments designated as accounting hedges	10	0
Other	45	74
Total other current assets	323	383
Other assets:
Investments in non-consolidated affiliates	149	135
Deposits for real-estate leases	15	19
Indemnification assets related to acquisitions	103	15
Mutual funds and fixed deposits	67	66
Company owned life insurance (at contract value)	35	17
Costs to obtain sales contracts	137	134
Derivative instruments designated as accounting hedges	49	57
Pension and other retirement employee benefits	19	21
Other	62	51
Total other assets	636	515
Accounts payable and accrued liabilities:
Salaries and benefits	196	197
Incentive compensation	248	226
Customer credits, advanced payments and advanced billings	96	42
Dividends	5	11
Professional service fees	68	53
Interest accrued on debt	46	82
Accounts payable	30	39
Income taxes	201	128
Pension and other retirement employee benefits	46	45
Accrued royalties	19	19
Foreign exchange forwards on certain assets and liabilities	10	2
Restructuring liability	8	18
Derivative instruments designated as accounting hedges	7	39
Other	104	138
Total accounts payable and accrued liabilities	1,084	1,039
Other liabilities:
Pension and other retirement employee benefits	204	244
Interest accrued on UTPs	82	113
MAKS indemnification provisions	33	33
Income tax liability - non-current portion	18	18
Derivative instruments designated as accounting hedges	46	145
Other	37	37
Total other liabilities	$ 420	$ 590