Borrowed Funds (FHLB Borrowings, Senior Debt and Subordinated Debt) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Borrowed funds	$ 60,822	$ 58,713
Total FHLB, Senior and Sub Debt	57,272	55,039
Parent Company
Debt Instrument [Line Items]
Borrowed funds	16,041	13,103
Parent Company \| Senior debt
Debt Instrument [Line Items]
Borrowed funds	$ 14,287	11,374
Parent Company \| Senior debt \| Minimum
Debt Instrument [Line Items]
Interest rate	1.15%
Parent Company \| Senior debt \| Maximum
Debt Instrument [Line Items]
Interest rate	6.04%
Parent Company \| Subordinated debt
Debt Instrument [Line Items]
Borrowed funds	$ 1,549	1,524
Parent Company \| Subordinated debt \| Minimum
Debt Instrument [Line Items]
Interest rate	3.90%
Parent Company \| Subordinated debt \| Maximum
Debt Instrument [Line Items]
Interest rate	4.63%
Parent Company \| Junior subordinated debt
Debt Instrument [Line Items]
Interest rate	5.53%
Borrowed funds	$ 205	205
Subsidiaries
Debt Instrument [Line Items]
Borrowed funds	41,231	41,936
Subsidiaries \| Senior debt
Debt Instrument [Line Items]
Borrowed funds	$ 5,335	5,283
Subsidiaries \| Senior debt \| Minimum
Debt Instrument [Line Items]
Interest rate	2.50%
Subsidiaries \| Senior debt \| Maximum
Debt Instrument [Line Items]
Interest rate	5.61%
Subsidiaries \| Subordinated debt
Debt Instrument [Line Items]
Borrowed funds	$ 3,876	4,578
Subsidiaries \| Subordinated debt \| Minimum
Debt Instrument [Line Items]
Interest rate	2.70%
Subsidiaries \| Subordinated debt \| Maximum
Debt Instrument [Line Items]
Interest rate	5.90%
Subsidiaries \| FHLB
Debt Instrument [Line Items]
Borrowed funds	$ 32,020	$ 32,075
Subsidiaries \| FHLB \| Minimum
Debt Instrument [Line Items]
Interest rate	5.00%
Subsidiaries \| FHLB \| Maximum
Debt Instrument [Line Items]
Interest rate	5.24%

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations excluding other borrowings.

No definition available.

+ Details

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- Definition

Amount of short-term and long-term debt and lease obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13,16)
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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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