Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
Summary of Significant Accounting Policies [Abstract]
Percentage Of Voting Interest For Which Company Would Determine That They Have Controlling Financial Interest	50.00%
Lower Range Of Voting Interest Unconsolidated VIE For Which Company Has Significant Influence Over	20.00%
Upper Range Of Voting Interest Unconsolidated VIE For Which Company Has Significant Influence Over	50.00%
Maximum Number Of Days Account Can Be Past Due Before Accrual Of Interest Stops	90
Consumer Credit Card Receivables Previously Classified Nonaccrual And Nonearning Returned To Accrual Status	$ 1,051
Real Estate And CLL Receivables Previously Classified Nonaccrual Returned To Accrual Status	1,524
Financing Receivables Previously Classified Nonaccrual And Accounted For On Cash Basis Returned To Accrual Status	2,174
Percentage In Excess Of Which Real Estate Projected Loan To Value Ratio At Maturity Is Evaluated For Impairment Classification	100.00%
Number Of Days Past Due Delinquent Receivable	30
Number Of Days Past Due Unsecured Closed End Installment Loans Are Written Off	120
Number Of Days Past Due Unsecured Open Ended Revolving Loans Are Written Off	180
Number Of Days Past Due Consumer Loans Secured By Collateral Other Than Residential Real Estate Write Off	120
Number Of Days Past Due Consumer Loans Secured By Residential Real Estate Before Written Down To Fair Value Of Collateral Less Costs To Sell	180
Number Of Days Past Due Consumer Credit Card Accounts Write Off	180	90
Number Of Days Past Due Unsecured Consumer Loans In Bankruptcy Before Written Off	60
Number Of Days After Initial Recognition Of Specific Reserve For Collateral Depecendent Loan Write Offs Recognized	360
Number of Days Commercial Smaller Balance Homogeneous Loans Are Written Off	180
Percentage of LIFO Inventory	39.00%		37.00%
Increase Decrease In Financing Receivables	271
Overall Impact Of Adoption Of ASU 2009-13 and ASU 2009-14	insignificant
Troubled Debt Restructuring [Member] | Adjustments for New Accounting Pronouncement [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Allowance for Loan and Lease Losses, Period Increase (Decrease)	$ 77