Certain Transfers of Financial Assets and Variable Interest Entities Portfolio Balances and Delinquency Balances Based on 90 days or more Past Due and Net Charge-Offs Related to Managed Portfolio Loans (Additional Information) (Details) - USD ($) $ in Millions		Jun. 30, 2016	Dec. 31, 2015
Servicing Assets at Fair Value [Line Items]
LHFS excluded from managed loans disclosure		$ 2,500	$ 1,800
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	[1]	267,716	258,212
Loans Held For Sale [Member]
Servicing Assets at Fair Value [Line Items]
LHFS Accruing90OrMoreDaysPastDueAndNonaccruingExcludedFromManagedLoanDisclosure		1	1
Asset-backed Securities, Securitized Loans and Receivables [Member]
Servicing Assets at Fair Value [Line Items]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	[1],[2]	122,646	117,797
Residential Portfolio Segment [Member] | Asset-backed Securities, Securitized Loans and Receivables [Member]
Servicing Assets at Fair Value [Line Items]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	[1],[2]	121,994	116,990
Residential Portfolio Segment [Member] | Asset-backed Securities, Securitized Loans and Receivables [Member] | STI Sponsored Securitizations [Member]
Servicing Assets at Fair Value [Line Items]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	[1]	452	501
Residential Portfolio Segment [Member] | Asset-backed Securities, Securitized Loans and Receivables [Member] | Managed Securitized Loans [Member]
Servicing Assets at Fair Value [Line Items]
Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement	[1]	$ 121,542	$ 116,489

[1] Excludes $2.5 billion and $1.8 billion of LHFS at June 30, 2016 and December 31, 2015, respectively.

[2] Excludes loans that have completed the foreclosure or short sale process (i.e., involuntary prepayments)