Revenue - Additional Information (Detail) $ in Millions	3 Months Ended	6 Months Ended
Jun. 26, 2020 USD ($) Customer	Jun. 28, 2019 Customer	Jun. 26, 2020 USD ($) Customer	Jun. 28, 2019 Customer	Dec. 31, 2019 USD ($)
Disaggregation Of Revenue [Line Items]
Receivable from clients balance	$ 479		$ 479		$ 470
Fees from mutual fund, insurance companies and other	$ 267		$ 267		$ 291
Number of customers \| Customer	1	1	1	1
Sales Revenue Net [Member] \| Customer [Member]
Disaggregation Of Revenue [Line Items]
Concentration Risk, Percentage	13.00%	14.00%	14.00%	14.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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Data Type:	num:percentItemType
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Period Type:	duration