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Loans and Allowance for Credit Losses, Loans by Delinquency Status, Consumer (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2008
By delinquency status:            
Loans $ 956,770 [1] $ 967,604 [1] $ 916,559 $ 862,551 $ 822,286  
Total Consumer [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 1,000 908        
By delinquency status:            
Loans 453,382 461,068 459,976 447,725 445,196  
Real estate 1-4 family first mortgage [Member]            
By delinquency status:            
Loans $ 284,054 $ 275,579 273,869 265,386 258,507  
Financing Receivables Equal To Or Greater Than 180 Days Past Due Percentage Of Portfolio 0.40% 0.60%        
Real estate 1-4 family junior lien mortgage [Member]            
By delinquency status:            
Loans $ 39,713 $ 46,237 53,004 59,717 65,950  
Credit Card [Member]            
By delinquency status:            
Loans 37,976 36,700 34,039 31,119 26,882  
Automobile [Member]            
By delinquency status:            
Loans 53,371 62,286 59,966 55,740 50,808  
Other revolving credit and installment [Member]            
By delinquency status:            
Loans 38,268 40,266 $ 39,098 $ 35,763 $ 43,049  
Loans Excluding Purchased Credit-Impaired Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 11,997 11,858        
Loans Excluding Purchased Credit-Impaired Loans [Member] | Consumer Real Estate Loans Government Guaranteed Or Insured [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 10,934 10,883        
Loans Excluding Purchased Credit-Impaired Loans [Member] | Student Loans, Government Guaranteed [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0 3        
Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Consumer [Member]            
By delinquency status:            
Loans 440,633 445,014        
Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family first mortgage [Member]            
By delinquency status:            
Loans 271,332 259,561        
Financing Receivable, Recorded Investment, Equal to Greater Than 180 Days Past Due and Still Accruing 1,100 1,700        
Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family junior lien mortgage [Member]            
By delinquency status:            
Loans 39,686 46,201        
Loans Excluding Purchased Credit-Impaired Loans [Member] | Credit Card [Member]            
By delinquency status:            
Loans 37,976 36,700        
Loans Excluding Purchased Credit-Impaired Loans [Member] | Automobile [Member]            
By delinquency status:            
Loans 53,371 62,286        
Loans Excluding Purchased Credit-Impaired Loans [Member] | Other revolving credit and installment [Member]            
By delinquency status:            
Loans 38,268 40,266        
Financing Receivables, 1 to 29 Days Past Due [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Consumer [Member]            
By delinquency status:            
Loans 416,858 420,477        
Financing Receivables, 1 to 29 Days Past Due [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family first mortgage [Member]            
By delinquency status:            
Loans 251,786 239,061        
Financing Receivables, 1 to 29 Days Past Due [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family junior lien mortgage [Member]            
By delinquency status:            
Loans 38,746 45,238        
Financing Receivables, 1 to 29 Days Past Due [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Credit Card [Member]            
By delinquency status:            
Loans 36,996 35,773        
Financing Receivables, 1 to 29 Days Past Due [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Automobile [Member]            
By delinquency status:            
Loans 51,445 60,572        
Financing Receivables, 1 to 29 Days Past Due [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Other revolving credit and installment [Member]            
By delinquency status:            
Loans 37,885 39,833        
Financing Receivables, 30 to 59 Days Past Due [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Consumer [Member]            
By delinquency status:            
Loans 4,056 3,914        
Financing Receivables, 30 to 59 Days Past Due [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family first mortgage [Member]            
By delinquency status:            
Loans 1,893 1,904        
Financing Receivables, 30 to 59 Days Past Due [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family junior lien mortgage [Member]            
By delinquency status:            
Loans 336 296        
Financing Receivables, 30 to 59 Days Past Due [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Credit Card [Member]            
By delinquency status:            
Loans 287 275        
Financing Receivables, 30 to 59 Days Past Due [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Automobile [Member]            
By delinquency status:            
Loans 1,385 1,262        
Financing Receivables, 30 to 59 Days Past Due [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Other revolving credit and installment [Member]            
By delinquency status:            
Loans 155 177        
Financing Receivables, 60 to 89 Days Past Due [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Consumer [Member]            
By delinquency status:            
Loans 1,591 1,501        
Financing Receivables, 60 to 89 Days Past Due [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family first mortgage [Member]            
By delinquency status:            
Loans 742 700        
Financing Receivables, 60 to 89 Days Past Due [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family junior lien mortgage [Member]            
By delinquency status:            
Loans 163 160        
Financing Receivables, 60 to 89 Days Past Due [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Credit Card [Member]            
By delinquency status:            
Loans 201 200        
Financing Receivables, 60 to 89 Days Past Due [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Automobile [Member]            
By delinquency status:            
Loans 392 330        
Financing Receivables, 60 to 89 Days Past Due [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Other revolving credit and installment [Member]            
By delinquency status:            
Loans 93 111        
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Real Estate Loans Government Guaranteed Or Insured [Member]            
By delinquency status:            
Loans 10,500 10,100        
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Total Consumer [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 3,000 3,500        
90-119 Days Past Due [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Consumer [Member]            
By delinquency status:            
Loans 890 787        
90-119 Days Past Due [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family first mortgage [Member]            
By delinquency status:            
Loans 369 307        
90-119 Days Past Due [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family junior lien mortgage [Member]            
By delinquency status:            
Loans 103 102        
90-119 Days Past Due [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Credit Card [Member]            
By delinquency status:            
Loans 192 169        
90-119 Days Past Due [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Automobile [Member]            
By delinquency status:            
Loans 146 116        
90-119 Days Past Due [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Other revolving credit and installment [Member]            
By delinquency status:            
Loans 80 93        
120-179 DPD member [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Consumer [Member]            
By delinquency status:            
Loans 734 745        
120-179 DPD member [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family first mortgage [Member]            
By delinquency status:            
Loans 308 323        
120-179 DPD member [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family junior lien mortgage [Member]            
By delinquency status:            
Loans 95 108        
120-179 DPD member [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Credit Card [Member]            
By delinquency status:            
Loans 298 279        
120-179 DPD member [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Automobile [Member]            
By delinquency status:            
Loans 3 5        
120-179 DPD member [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Other revolving credit and installment [Member]            
By delinquency status:            
Loans 30 30        
180 plus DPD [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Consumer [Member]            
By delinquency status:            
Loans 1,361 1,985        
180 plus DPD [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family first mortgage [Member]            
By delinquency status:            
Loans 1,091 1,661        
180 plus DPD [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family junior lien mortgage [Member]            
By delinquency status:            
Loans 243 297        
180 plus DPD [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Credit Card [Member]            
By delinquency status:            
Loans 2 4        
180 plus DPD [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Automobile [Member]            
By delinquency status:            
Loans 0 1        
180 plus DPD [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Other revolving credit and installment [Member]            
By delinquency status:            
Loans 25 22        
Loans Insured or Guaranteed by US Government Authorities [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Consumer [Member]            
By delinquency status:            
Loans 15,143 15,605        
Loans Insured or Guaranteed by US Government Authorities [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family first mortgage [Member]            
By delinquency status:            
Loans 15,143 15,605        
Loans Insured or Guaranteed by US Government Authorities [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family junior lien mortgage [Member]            
By delinquency status:            
Loans 0 0        
Loans Insured or Guaranteed by US Government Authorities [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Credit Card [Member]            
By delinquency status:            
Loans 0 0        
Loans Insured or Guaranteed by US Government Authorities [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Automobile [Member]            
By delinquency status:            
Loans 0 0        
Loans Insured or Guaranteed by US Government Authorities [Member] | Loans Excluding Purchased Credit-Impaired Loans [Member] | Other revolving credit and installment [Member]            
By delinquency status:            
Loans 0 0        
PCI Loans Carrying Value [Member]            
By delinquency status:            
Total PCI loans (carrying value) 12,835 16,731        
PCI Loans Carrying Value [Member] | Total Consumer [Member]            
By delinquency status:            
Total PCI loans (carrying value) 12,749 16,054       $ 40,100
PCI Loans Carrying Value [Member] | Real estate 1-4 family first mortgage [Member]            
By delinquency status:            
Total PCI loans (carrying value) 12,722 16,018        
PCI Loans Carrying Value [Member] | Real estate 1-4 family junior lien mortgage [Member]            
By delinquency status:            
Total PCI loans (carrying value) 27 36        
PCI Loans Carrying Value [Member] | Credit Card [Member]            
By delinquency status:            
Total PCI loans (carrying value) 0 0        
PCI Loans Carrying Value [Member] | Automobile [Member]            
By delinquency status:            
Total PCI loans (carrying value) 0 0        
PCI Loans Carrying Value [Member] | Other revolving credit and installment [Member]            
By delinquency status:            
Total PCI loans (carrying value) $ 0 $ 0        
[1] (2)Parenthetical amounts represent assets and liabilities for which we have elected the fair value option.