Supplemental Information About The Credit Quality Of Financing Receivables And Allowance For Losses On Financing Receivables (Consumer) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Financing Receivables and Allowance for Losses
Loans and leases receivable, Gross	$ 262,380		$ 273,936
Credit Quality Indicators
Loans and leases receivable, Gross	262,380		273,936
Installment And Revolving Credit
Loans and leases receivable, Gross	262,380		273,936
Consumer - Other
Loans and leases receivable, Gross	262,380		273,936
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number Of Consumer Financing Receivable Customers Across US Including Private Label Credit Card And Sales Financing	55,000,000
Percentage of customers with no metropolitan statistical area	6.00%
Percentage Of US Consumer Financing Receivables Related To Credit Cards Loans	65.00%
Percentage Of US Consumer Financing Receivables Related To Sales Finance Receivables	35.00%
Financing Receivables and Allowance for Losses
Loans and leases receivable, Gross	110,914		115,180
General reserves	3,483		2,950
Total impaired loans	3,209		3,220
Allowance for losses (specific reserves)	668		674
Past Due Financing Receivables
Over 30 days past due	6.10%		6.50%
Over 90 days past due	3.20%		3.40%
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	22		24
Nonaccrual Financing Receivables
Nonaccrual loans	3,846		4,301
Nonearning financing receivables	3,780		4,194
Allowance for losses as a percent of nonaccrual financing receivables	107.90%		84.30%
Allowance for losses as a percent of nonearning financing receivables	109.80%		86.40%
Impaired Loans
Total impaired loans	3,209		3,220
Allowance for losses (specific reserves)	668		674
Average investment in loans	3,211		3,056
Interest income recognized	115	76	169
Interest income recognized on a cash basis	1	3	5
Credit Quality Indicators
Maximum Percentage Of Private Label Consumer Financing Receivables Located In Any Metropolitan Area	5.00%
Loans and leases receivable, Gross	110,914		115,180
Installment And Revolving Credit
Loans and leases receivable, Gross	110,914		115,180
Consumer - Other
Loans and leases receivable, Gross	110,914		115,180
Consumer Portfolio Segment [Member] | Score 614 or Less [Member]
Installment And Revolving Credit
Percent of Financing Receivable Accounts With Credit Bureau Equivalent of 614 Or Less	97.00%
Consumer Portfolio Segment [Member] | Troubled Debt Restructuring [Member]
Impaired Loans
Financing Receivable, Modifications, Recorded Investment	3,068		3,053
Changes In Loans Modified As Troubled Debt Restructurings	852
Loans Modified As Troubled Debt Restructuring That Have Subsequently Experienced Payment Default	158	352
Consumer Portfolio Segment [Member] | Performing Financing Receivable [Member]
Financing Receivables and Allowance for Losses
Non-impaired financing receivables	107,705		111,960
Consumer Portfolio Segment [Member] | No Related Allowance [Member]
Impaired Loans
Financing Receivable, Modifications, Recorded Investment	85
Consumer Portfolio Segment [Member] | Related Allowance [Member]
Impaired Loans
Unpaid principal balance	3,183
Average investment in loans	3,117
Financing Receivable, Modifications, Recorded Investment	3,124
Consumer Portfolio Segment [Member] | Impaired Loans [Member]
Financing Receivables and Allowance for Losses
Allowance for losses (specific reserves)	668
Impaired Loans
Unpaid principal balance	3,298
Allowance for losses (specific reserves)	668
Financing Receivable, Modifications, Recorded Investment	3,209
Consumer Portfolio Segment [Member] | Modifications Classified As TDRs In Last Twelve Months [Member]
Impaired Loans
Financing Receivable, Modifications, Recorded Investment	1,694	2,106
Consumer Portfolio Segment [Member] | Non US residential mortgages [Member]
Financing Receivables and Allowance for Losses
Loans and leases receivable, Gross	31,784		33,451
Past Due Financing Receivables
Over 30 days past due	11.80%		12.00%
Over 90 days past due	7.40%		7.50%
Nonaccrual Financing Receivables
Nonaccrual loans	2,399		2,600
Nonearning financing receivables	2,388		2,569
Credit Quality Indicators
Loans and leases receivable, Gross	31,784		33,451
Percent Of Non US Mortgages With Loan To Value Ratios Greater Than 90 Percent Covered By Third Party Mortgage Insurance	30.00%
Installment And Revolving Credit
Loans and leases receivable, Gross	31,784		33,451
Consumer - Other
Loans and leases receivable, Gross	31,784		33,451
Consumer Portfolio Segment [Member] | Non US residential mortgages [Member] | Loan To Value Ratio Less Than 80 Percent [Member]
Financing Receivables and Allowance for Losses
Loans and leases receivable, Gross	17,764		18,613
Credit Quality Indicators
Loans and leases receivable, Gross	17,764		18,613
Installment And Revolving Credit
Loans and leases receivable, Gross	17,764		18,613
Consumer - Other
Loans and leases receivable, Gross	17,764		18,613
Consumer Portfolio Segment [Member] | Non US residential mortgages [Member] | Loan To Value Ratio From 80 To 90 Percent [Member]
Financing Receivables and Allowance for Losses
Loans and leases receivable, Gross	5,340		5,739
Credit Quality Indicators
Loans and leases receivable, Gross	5,340		5,739
Installment And Revolving Credit
Loans and leases receivable, Gross	5,340		5,739
Consumer - Other
Loans and leases receivable, Gross	5,340		5,739
Consumer Portfolio Segment [Member] | Non US residential mortgages [Member] | Loan To Value Ratio Greater Than 90 Percent [Member]
Financing Receivables and Allowance for Losses
Loans and leases receivable, Gross	8,680		9,099
Credit Quality Indicators
Loans and leases receivable, Gross	8,680		9,099
Installment And Revolving Credit
Loans and leases receivable, Gross	8,680		9,099
Consumer - Other
Loans and leases receivable, Gross	8,680		9,099
Consumer Portfolio Segment [Member] | Non US residential mortgages [Member] | UK [Member]
Credit Quality Indicators
Reindexed Loan To Value Ratios Of Non US Mortgages	80.00%
Consumer Portfolio Segment [Member] | Non US residential mortgages [Member] | France [Member]
Credit Quality Indicators
Reindexed Loan To Value Ratios Of Non US Mortgages	57.00%
Consumer Portfolio Segment [Member] | Non US installment and revolving credit [Member]
Financing Receivables and Allowance for Losses
Loans and leases receivable, Gross	17,620		18,546
Past Due Financing Receivables
Over 30 days past due	4.00%		3.90%
Over 90 days past due	1.20%		1.10%
Nonaccrual Financing Receivables
Nonaccrual loans	225		224
Nonearning financing receivables	225		224
Credit Quality Indicators
Loans and leases receivable, Gross	17,620		18,546
Installment And Revolving Credit
Loans and leases receivable, Gross	17,620		18,546
Consumer - Other
Loans and leases receivable, Gross	17,620		18,546
Consumer Portfolio Segment [Member] | Non US installment and revolving credit [Member] | Score 615 to 680 [Member]
Financing Receivables and Allowance for Losses
Loans and leases receivable, Gross	4,162		4,496
Credit Quality Indicators
Loans and leases receivable, Gross	4,162		4,496
Installment And Revolving Credit
Loans and leases receivable, Gross	4,162		4,496
Consumer - Other
Loans and leases receivable, Gross	4,162		4,496
Consumer Portfolio Segment [Member] | Non US installment and revolving credit [Member] | Score 614 or Less [Member]
Financing Receivables and Allowance for Losses
Loans and leases receivable, Gross	3,196		3,557
Credit Quality Indicators
Loans and leases receivable, Gross	3,196		3,557
Installment And Revolving Credit
Loans and leases receivable, Gross	3,196		3,557
Consumer - Other
Loans and leases receivable, Gross	3,196		3,557
Consumer Portfolio Segment [Member] | Non US installment and revolving credit [Member] | Secured Credit Quality Indicator Low Risk [Member] | Score 681 or Higher [Member]
Financing Receivables and Allowance for Losses
Loans and leases receivable, Gross	10,262		10,493
Credit Quality Indicators
Loans and leases receivable, Gross	10,262		10,493
Installment And Revolving Credit
Loans and leases receivable, Gross	10,262		10,493
Consumer - Other
Loans and leases receivable, Gross	10,262		10,493
Consumer Portfolio Segment [Member] | US installment and revolving credit [Member]
Financing Receivables and Allowance for Losses
Loans and leases receivable, Gross	50,155		50,853
Past Due Financing Receivables
Over 30 days past due	3.90%		4.60%
Over 90 days past due	1.70%		2.00%
Nonaccrual Financing Receivables
Nonaccrual loans	822		1,026
Nonearning financing receivables	822		1,026
Credit Quality Indicators
Loans and leases receivable, Gross	50,155		50,853
Installment And Revolving Credit
Loans and leases receivable, Gross	50,155		50,853
Consumer - Other
Loans and leases receivable, Gross	50,155		50,853
Consumer Portfolio Segment [Member] | US installment and revolving credit [Member] | Score 615 to 680 [Member]
Financing Receivables and Allowance for Losses
Loans and leases receivable, Gross	9,876		9,753
Credit Quality Indicators
Loans and leases receivable, Gross	9,876		9,753
Installment And Revolving Credit
Loans and leases receivable, Gross	9,876		9,753
Consumer - Other
Loans and leases receivable, Gross	9,876		9,753
Consumer Portfolio Segment [Member] | US installment and revolving credit [Member] | Score 614 or Less [Member]
Financing Receivables and Allowance for Losses
Loans and leases receivable, Gross	7,410		7,896
Credit Quality Indicators
Loans and leases receivable, Gross	7,410		7,896
Installment And Revolving Credit
Loans and leases receivable, Gross	7,410		7,896
Consumer - Other
Loans and leases receivable, Gross	7,410		7,896
Consumer Portfolio Segment [Member] | US installment and revolving credit [Member] | Secured Credit Quality Indicator Low Risk [Member] | Score 681 or Higher [Member]
Financing Receivables and Allowance for Losses
Loans and leases receivable, Gross	32,869		33,204
Credit Quality Indicators
Loans and leases receivable, Gross	32,869		33,204
Installment And Revolving Credit
Loans and leases receivable, Gross	32,869		33,204
Consumer - Other
Loans and leases receivable, Gross	32,869		33,204
Consumer Portfolio Segment [Member] | Non US auto [Member]
Financing Receivables and Allowance for Losses
Loans and leases receivable, Gross	3,808		4,260
Past Due Financing Receivables
Over 30 days past due	3.30%		3.10%
Over 90 days past due	0.40%		0.50%
Nonaccrual Financing Receivables
Nonaccrual loans	21		24
Nonearning financing receivables	21		24
Credit Quality Indicators
Loans and leases receivable, Gross	3,808		4,260
Installment And Revolving Credit
Loans and leases receivable, Gross	3,808		4,260
Consumer - Other
Loans and leases receivable, Gross	3,808		4,260
Consumer Portfolio Segment [Member] | Non US auto [Member] | Score 615 to 680 [Member]
Financing Receivables and Allowance for Losses
Loans and leases receivable, Gross	546		666
Credit Quality Indicators
Loans and leases receivable, Gross	546		666
Installment And Revolving Credit
Loans and leases receivable, Gross	546		666
Consumer - Other
Loans and leases receivable, Gross	546		666
Consumer Portfolio Segment [Member] | Non US auto [Member] | Score 614 or Less [Member]
Financing Receivables and Allowance for Losses
Loans and leases receivable, Gross	381		453
Credit Quality Indicators
Loans and leases receivable, Gross	381		453
Installment And Revolving Credit
Loans and leases receivable, Gross	381		453
Consumer - Other
Loans and leases receivable, Gross	381		453
Consumer Portfolio Segment [Member] | Non US auto [Member] | Secured Credit Quality Indicator Low Risk [Member] | Score 681 or Higher [Member]
Financing Receivables and Allowance for Losses
Loans and leases receivable, Gross	2,881		3,141
Credit Quality Indicators
Loans and leases receivable, Gross	2,881		3,141
Installment And Revolving Credit
Loans and leases receivable, Gross	2,881		3,141
Consumer - Other
Loans and leases receivable, Gross	2,881		3,141
Consumer Portfolio Segment [Member] | Consumer Other Financing Receivable [Member]
Financing Receivables and Allowance for Losses
Loans and leases receivable, Gross	7,547		8,070
Past Due Financing Receivables
Over 30 days past due	2.80%		2.80%
Over 90 days past due	1.60%		1.70%
Nonaccrual Financing Receivables
Nonaccrual loans	379		427
Nonearning financing receivables	324		351
Credit Quality Indicators
Loans and leases receivable, Gross	7,547		8,070
Installment And Revolving Credit
Loans and leases receivable, Gross	7,547		8,070
Consumer - Other
Loans and leases receivable, Gross	7,547		8,070
Consumer Portfolio Segment [Member] | Consumer Other Financing Receivable [Member] | Secured Credit Quality Indicator Low Risk [Member]
Financing Receivables and Allowance for Losses
Loans and leases receivable, Gross	6,385		6,873
Credit Quality Indicators
Loans and leases receivable, Gross	6,385		6,873
Installment And Revolving Credit
Loans and leases receivable, Gross	6,385		6,873
Consumer - Other
Loans and leases receivable, Gross	6,385		6,873
Consumer Portfolio Segment [Member] | Consumer Other Financing Receivable [Member] | Secured Credit Quality Indicator Moderate Risk [Member]
Financing Receivables and Allowance for Losses
Loans and leases receivable, Gross	433		451
Credit Quality Indicators
Loans and leases receivable, Gross	433		451
Installment And Revolving Credit
Loans and leases receivable, Gross	433		451
Consumer - Other
Loans and leases receivable, Gross	433		451
Consumer Portfolio Segment [Member] | Consumer Other Financing Receivable [Member] | Secured Credit Quality Indicator High Risk [Member]
Financing Receivables and Allowance for Losses
Loans and leases receivable, Gross	729		746
Credit Quality Indicators
Loans and leases receivable, Gross	729		746
Installment And Revolving Credit
Loans and leases receivable, Gross	729		746
Consumer - Other
Loans and leases receivable, Gross	729		746
Consumer Portfolio Segment [Member] | Consumer Other Portfolio [Member]
Financing Receivables and Allowance for Losses
Allowance for losses (specific reserves)	73
Impaired Loans
Allowance for losses (specific reserves)	73
Consumer Portfolio Segment [Member] | Consumer Other Portfolio [Member] | Related Allowance [Member]
Impaired Loans
Financing Receivable, Modifications, Recorded Investment	312
Consumer Portfolio Segment [Member] | Remaining Consumer Business [Member]
Financing Receivables and Allowance for Losses
Allowance for losses (specific reserves)	595
Impaired Loans
Allowance for losses (specific reserves)	595
Consumer Portfolio Segment [Member] | Remaining Consumer Business [Member] | Related Allowance [Member]
Impaired Loans
Financing Receivable, Modifications, Recorded Investment	2,812
Consumer Portfolio Segment [Member] | Non US Consumer [Member] | Troubled Debt Restructuring [Member]
Impaired Loans
Changes In Loans Modified As Troubled Debt Restructurings	541
Consumer Portfolio Segment [Member] | Credit Card Loans [Member] | Troubled Debt Restructuring [Member]
Impaired Loans
Changes In Loans Modified As Troubled Debt Restructurings	$ 311