Supplemental Cash Flows Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
All other operating activities
Amortization of Intangible Assets	$ 425	$ 447	$ 562
Net realized losses on investment securities	523	34	197
Cash collateral on derivative contracts	(2,271)	2,900	1,247
Increase (decrease) in other liabilities	2,334	560	(1,344)
Other	(912)	1,477	2,465
All other operating activities	99	5,418	3,127
Net decrease (increase) in financing receivables
Increase in loans to customers	(311,860)	(308,156)	(322,270)
Principal collections from customers - loans	307,849	307,250	332,100
Investment in equipment for financing leases	(8,652)	(9,192)	(9,610)
Principal collections from customers - financing leases	9,646	10,976	12,431
Net change in credit card receivables	(8,058)	(8,030)	(6,243)
Sales of financing receivables	14,664	12,642	8,117
Net decrease (increase) in financing receivables	3,589	5,490	14,525
All other investing activities
Purchases of investment securities	(16,422)	(15,666)	(20,816)
Dispositions and maturities of investment securities	18,139	17,010	19,535
Decrease (increase) in other assets - investments	1,089	4,338	2,672
Proceeds from Sale of Real Estate	10,680	3,381	3,152
Other	1,486	2,731	3,190
All other investing activities	14,972	11,794	7,733
Newly issued debt (maturities longer than 90 days)
Short-term (91 to 365 days)	55	59	10
Long-term (longer than one year)	44,833	55,782	43,257
Newly issued debt (maturities longer than 90 days)	44,888	55,841	43,267
Repayments and other reductions (maturities longer than 90 days)
Short-term (91 to 365 days)	(52,553)	(94,114)	(81,918)
Long-term (longer than one year)	(3,291)	(9,368)	(2,786)
Principal payments - nonrecourse, leveraged leases	(585)	(426)	(732)
Repayments and other reductions (maturities longer than 90 days)	(56,429)	(103,908)	(85,436)
All other financing activities
Proceeds from sales of investment contracts	491	2,697	4,396
Redemption of investment contracts	(980)	(5,515)	(6,230)
Other	(420)	(49)	42
All other financing activities	$ (909)	$ (2,867)	$ (1,792)