Contingencies, Commitments and Guarantees (Contingencies, Commitments and Guarantees - Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 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	177	$ 25	193	$ 42
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	1		1
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	358		358		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	$ 2,400		$ 2,400		$ 2,300