Securitizations and Variable Interest Entities, Off-Balance Sheet Loans Sold or Securitized (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Principal Balances - Off-Balance Sheet Securitized Loans [Abstract]
Total loans	$ 1,167,846		$ 1,202,301
Delinquent loans and foreclosed assets	8,964		9,955
Net charge-offs	146	$ 126
FNMA, FHLMC and GNMA [Member]
Principal Balances - Off-Balance Sheet Securitized Loans [Abstract]
Total loans	1,100,000		1,100,000
Securitizations and Variable Interest Entities Textual [Abstract]
Foreclosed assets	451		442
Delinquent loans	5,800		6,400
Total Commercial [Member]
Principal Balances - Off-Balance Sheet Securitized Loans [Abstract]
Total loans	106,087		105,173
Delinquent loans and foreclosed assets	976		1,008
Net charge-offs	79	10
Securitizations and Variable Interest Entities Textual [Abstract]
Foreclosed assets	550		675
Commercial real estate mortgage [Member]
Principal Balances - Off-Balance Sheet Securitized Loans [Abstract]
Total loans	106,087		105,173
Delinquent loans and foreclosed assets	976		1,008
Net charge-offs	79	10
Total Consumer [Member]
Principal Balances - Off-Balance Sheet Securitized Loans [Abstract]
Total loans	1,061,759		1,097,128
Delinquent loans and foreclosed assets	7,988		8,947
Net charge-offs	67	116
Securitizations and Variable Interest Entities Textual [Abstract]
Foreclosed assets	575		582
Real estate 1-4 family first mortgage [Member]
Principal Balances - Off-Balance Sheet Securitized Loans [Abstract]
Total loans	1,061,759		1,097,128
Delinquent loans and foreclosed assets	7,988		$ 8,947
Net charge-offs	$ 67	$ 116

Principal amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction. Continuing involvement includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=109247956&loc=d3e107314-111719

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- Definition

This is the principal amount of loans (across all types of loans) that are overdue in payment by a set number of days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (e)(4)
-URI http://asc.fasb.org/extlink&oid=109247956&loc=d3e107314-111719

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- Definition

Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11
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- Definition

Amount of credit loss after recoveries for transferred financial assets that continue to be recognized in the statement of financial position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (e)(5)
-URI http://asc.fasb.org/extlink&oid=109247956&loc=d3e107314-111719

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- Definition

Includes off balance-sheet amounts sold or securitized for both the principal amount of loans (across all types of loans) that are overdue in payment by a set number of days, and the carrying amount of assets obtained through foreclosure proceedings.

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No definition available.

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Securitizations and Variable Interest Entities Textual Abstract.

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