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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

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- Definition Provision for (recoveries of) credit losses on loans and leases. + References No definition available. + Details
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