Derivatives and Foreign Currency Operations - Schedule of Fair Value of Derivative Financial Instruments (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Fair value of derivatives, liability	$ (110)	$ (5)
Derivatives Designated as Effective Hedges \| Cash flow hedges \| Foreign exchange contract
Derivatives, Fair Value [Line Items]
Fair value of derivatives, asset	1	1
Fair value of derivatives, liability	(19)	(13)
Derivatives Designated as Effective Hedges \| Fair value hedges \| Interest rate swap
Derivatives, Fair Value [Line Items]
Fair value of derivatives, asset	7	2
Fair value of derivatives, liability	0	(1)
Derivatives Designated as Effective Hedges \| Net investment hedges \| Currency swap
Derivatives, Fair Value [Line Items]
Fair value of derivatives, asset	10	0
Fair value of derivatives, liability	(102)	0
Derivatives Not Designated as Effective Hedges \| Foreign exchange contract
Derivatives, Fair Value [Line Items]
Fair value of derivatives, asset	10	10
Fair value of derivatives, liability	$ (17)	$ (4)

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=121570589&loc=SL51823488-111719

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313

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Period Type:	instant