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Loans and Leases - Schedule of Credit Quality Indicator, Loan Class and Year of Origination the Amortized Cost Basis of Loans And Leases (Details) $ in Millions	Sep. 30, 2022 USD ($)
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	$ 48,984
Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	44,137
Other Loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	4,847
Pass | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	41,843
Pass | Other Loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	4,843
Special Mention | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	1,321
Substandard | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	973
Substandard | Other Loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	4
2022
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	8,412
2022 | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	7,655
2022 | Other Loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	757
2022 | Pass | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	7,655
2022 | Pass | Other Loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	757
2021
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	9,952
2021 | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	9,310
2021 | Other Loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	642
2021 | Pass | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	9,310
2021 | Pass | Other Loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	642
2020
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	9,316
2020 | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	8,859
2020 | Other Loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	457
2020 | Pass | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	8,727
2020 | Pass | Other Loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	457
2020 | Special Mention | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	95
2020 | Substandard | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	37
2019
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	5,806
2019 | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	5,382
2019 | Other Loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	424
2019 | Pass | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	4,960
2019 | Pass | Other Loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	423
2019 | Special Mention | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	221
2019 | Substandard | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	201
2019 | Substandard | Other Loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	1
2018
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	4,312
2018 | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	4,232
2018 | Other Loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	80
2018 | Pass | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	3,825
2018 | Pass | Other Loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	78
2018 | Special Mention | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	277
2018 | Substandard | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	130
2018 | Substandard | Other Loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	2
Prior to 2018
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	8,911
Prior to 2018 | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	8,687
Prior to 2018 | Other Loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	224
Prior to 2018 | Pass | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	7,354
Prior to 2018 | Pass | Other Loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	223
Prior to 2018 | Special Mention | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	728
Prior to 2018 | Substandard | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	605
Prior to 2018 | Substandard | Other Loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	1
Revolving Loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	2,275
Revolving Loans | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	12
Revolving Loans | Other Loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	2,263
Revolving Loans | Pass | Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	12
Revolving Loans | Pass | Other Loans
Financing Receivable, Recorded Investment [Line Items]
Loans and lease receivable amortized cost basis	$ 2,263

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