Allowance for Credit Losses on Loans and Leases - Summary of Activity in Allowance for Loan and Lease Losses (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Valuation Allowance [Line Items]
Balance, beginning of period	$ 199	$ 194
Charge-offs	(4)	(5)
Recoveries	9	12
Provision for (recovery of) credit losses	12	1
Balance, end of period	216	202
Mortgage Receivable
Valuation Allowance [Line Items]
Balance, beginning of period	178	176
Charge-offs	(4)	(2)
Recoveries	4	2
Provision for (recovery of) credit losses	30	1
Balance, end of period	208	177
Other Loans
Valuation Allowance [Line Items]
Balance, beginning of period	21	18
Charge-offs		(3)
Recoveries	5	10
Provision for (recovery of) credit losses	(18)
Balance, end of period	$ 8	$ 25