Borrowed Funds (FHLB Borrowings, Bank Notes, Senior Debt and Subordinated Debt) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Borrowed funds	$ 30,784	$ 37,195
Total FHLB, Senior and Sub Debt	27,657	34,174
Parent Company
Debt Instrument [Line Items]
Borrowed funds	11,351	10,583
Bank
Debt Instrument [Line Items]
Borrowed funds	16,306	23,591
Senior Notes \| Parent Company
Debt Instrument [Line Items]
Borrowed funds	$ 10,369	9,573
Senior Notes \| Parent Company \| Minimum
Debt Instrument [Line Items]
Stated interest rate	1.15%
Senior Notes \| Parent Company \| Maximum
Debt Instrument [Line Items]
Stated interest rate	3.50%
Senior Notes \| Bank
Debt Instrument [Line Items]
Borrowed funds	$ 10,292	14,698
Senior Notes \| Bank \| Minimum
Debt Instrument [Line Items]
Stated interest rate	0.00%
Senior Notes \| Bank \| Maximum
Debt Instrument [Line Items]
Stated interest rate	3.50%
Subordinated Debt \| Parent Company
Debt Instrument [Line Items]
Borrowed funds	$ 777	805
Stated interest rate	3.90%
Subordinated Debt \| Bank
Debt Instrument [Line Items]
Borrowed funds	$ 6,014	5,393
Subordinated Debt \| Bank \| Minimum
Debt Instrument [Line Items]
Stated interest rate	2.70%
Subordinated Debt \| Bank \| Maximum
Debt Instrument [Line Items]
Stated interest rate	5.90%
Junior Subordinated Debt \| Parent Company
Debt Instrument [Line Items]
Borrowed funds	$ 205	205
Stated interest rate	0.74%
FHLB \| Bank
Debt Instrument [Line Items]
Borrowed funds		$ 3,500

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.

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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)
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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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 http://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 http://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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