Contingencies, Commitments and Guarantees (Contingencies, Commitments and Guarantees - Narrative) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Cumulative maximum indemnities and guarantees contractual limitation	$ 118			$ 118
Liabilities for indemnities, guarantees and commitments	1			1		$ 1
Loss Contingencies [Line Items]
Other	70		$ 52	332	$ 164
Non-litigation loss
Loss Contingencies [Line Items]
Other		$ 140
Minimum
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Indemnities And Guarantees Contractual Limitation Range	6			6
Minimum | Non-litigation loss
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Loss Contingency, Range of Possible Loss, Portion Not Accrued	0			0
Maximum
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Loss Contingency, Range of Possible Loss, Portion Not Accrued	10			10
Indemnities And Guarantees Contractual Limitation Range	112			112
Maximum | Non-litigation loss
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Loss Contingency, Range of Possible Loss, Portion Not Accrued	125			125
Mortgage Loan Commitments
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability	439			439		719
Commitments to Fund Partnership Investments and Private Corporate Bond Investments
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability	$ 2,200			$ 2,200		$ 2,300