Investments - Investments in Funds that are Calculated Using Net Asset Value Per Share (Detail) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Cash Instruments Assets [Member]
Fair Value, Investments, Entities That Are Calculated Using Net Asset Value Per Share [Line Items]
Fair Value of Investments	$ 3,517	$ 4,206
Cash Instruments Liabilities [Member]
Fair Value, Investments, Entities That Are Calculated Using Net Asset Value Per Share [Line Items]
Unfunded Commitments	1,526	1,781
Private Equity Funds [Member] \| Cash Instruments Assets [Member]
Fair Value, Investments, Entities That Are Calculated Using Net Asset Value Per Share [Line Items]
Fair Value of Investments	1,906	2,767
Private Equity Funds [Member] \| Cash Instruments Liabilities [Member]
Fair Value, Investments, Entities That Are Calculated Using Net Asset Value Per Share [Line Items]
Unfunded Commitments	553	765
Credit Funds [Member] \| Cash Instruments Assets [Member]
Fair Value, Investments, Entities That Are Calculated Using Net Asset Value Per Share [Line Items]
Fair Value of Investments	1,220	983
Credit Funds [Member] \| Cash Instruments Liabilities [Member]
Fair Value, Investments, Entities That Are Calculated Using Net Asset Value Per Share [Line Items]
Unfunded Commitments	756	820
Hedge Funds [Member] \| Cash Instruments Assets [Member]
Fair Value, Investments, Entities That Are Calculated Using Net Asset Value Per Share [Line Items]
Fair Value of Investments	101	125
Real Estate Funds [Member] \| Cash Instruments Assets [Member]
Fair Value, Investments, Entities That Are Calculated Using Net Asset Value Per Share [Line Items]
Fair Value of Investments	290	331
Real Estate Funds [Member] \| Cash Instruments Liabilities [Member]
Fair Value, Investments, Entities That Are Calculated Using Net Asset Value Per Share [Line Items]
Unfunded Commitments	$ 217	$ 196

Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 6A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=SL6742756-110258

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 35
-Paragraph 54B
-URI http://asc.fasb.org/extlink&oid=117332851&loc=SL7495116-110257

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 6A
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=SL6742756-110258

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