Allowance for Credit Losses on Loans and Leases - Summary of Activity in Allowance for Loan and Lease Losses (Details) - USD ($) $ in Millions		12 Months Ended
	Jan. 01, 2020	Dec. 31, 2021	Dec. 31, 2020
Valuation Allowance [Line Items]
Balance, beginning of period	$ 148	$ 194	$ 148
Accounting Standards Update [Extensible List]			Accounting Standards Update 2016-13
Charge-offs		(13)	$ (22)
Recoveries	2	15	3
Provision for (recovery of) credit losses on loans and leases		3
Balance, end of period		199	194
Cumulative Effect, Period of Adoption, Adjustment
Valuation Allowance [Line Items]
Balance, beginning of period	2		$ 2
Accounting Standards Update [Extensible List]			Accounting Standards Update 2016-13
Adjusted Balance
Valuation Allowance [Line Items]
Balance, beginning of period	150	194	$ 150
Balance, end of period			194
Mortgage Receivable
Valuation Allowance [Line Items]
Balance, beginning of period	123	176	123
Charge-offs		(6)	(2)
Recoveries		2	1
Balance, end of period		178	176
Mortgage Receivable | Adjusted Balance
Valuation Allowance [Line Items]
Balance, beginning of period	123	176	123
Balance, end of period			176
Other Loans
Valuation Allowance [Line Items]
Balance, beginning of period	25	18	$ 25
Accounting Standards Update [Extensible List]			Accounting Standards Update 2016-13
Charge-offs		(7)	$ (20)
Recoveries		13	2
Balance, end of period		21	18
Other Loans | Cumulative Effect, Period of Adoption, Adjustment
Valuation Allowance [Line Items]
Balance, beginning of period	2		2
Other Loans | Adjusted Balance
Valuation Allowance [Line Items]
Balance, beginning of period	$ 27	18	27
Balance, end of period			18
Non-Covered Loans
Valuation Allowance [Line Items]
Provision for (recovery of) credit losses on loans and leases			63
Non-Covered Loans | Mortgage Receivable
Valuation Allowance [Line Items]
Provision for (recovery of) credit losses on loans and leases		6	54
Non-Covered Loans | Other Loans
Valuation Allowance [Line Items]
Provision for (recovery of) credit losses on loans and leases		$ (3)	$ 9