Investment Securities - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021
Schedule of Held-to-maturity Securities [Line Items]
Amount of investment securities transferred from AFS to HTM for capital management purposes	$ 73,200
Approximate percentage rated at least AA+	98.00%	98.00%
Investment securities, allowance for credit losses	$ 47	$ 42	$ 87
Unrealized gains/(losses) on investment securities
Schedule of Held-to-maturity Securities [Line Items]
Pretax unrealized losses included in AOCI on the securities at the date of transfer	$ 4,600

Debt Securities, Available-for-sale, Transfer to Held-to-maturity, Amount

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- Definition

Debt Securities, Held-To-Maturity, External Credit Rating, Percent Rated AA Plus Or Higher

+ References

No definition available.

+ Details

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- Definition

Amount of allowance for credit loss on investment in debt security measured at amortized cost (held-to-maturity) and investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aaa)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aaa)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27232-111563

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- Definition

Amount, before tax, of adjustment from accumulated other comprehensive income (loss) for amortization of gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) from transfer to investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 35
-Paragraph 10B
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=124260725&loc=SL120268667-111560

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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

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