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Commitments, Contingencies and Guarantees (Guarantees Issued) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Treaty guarantees
Guarantor Obligations [Line Items]
Guarantor Obligations, Current Carrying Value	$ 2,104	$ 1,934
Treaty guarantees, net of assets in trust
Guarantor Obligations [Line Items]
Guarantor Obligations, Current Carrying Value	1,133	961
Securities borrowing and repurchase arrangements
Guarantor Obligations [Line Items]
Guarantor Obligations, Current Carrying Value	$ 136	$ 133

X

- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=124440162&loc=d3e12069-110248

+ Details

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X

- 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.

+ Details

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- Details

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- Details

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