Fair Value Measurement - Level 3 Analysis (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Level 3 Analysis - Supplemental Data [Abstract]
Percentage of level 3 assets in total Firm assets	3.10%
Increase (decrease) in level 3 assets	$ (28,800,000,000)
Equity derivative [Member]
Level 3 Analysis - Supplemental Data [Abstract]
Increase (decrease) in level 3 assets	2,100,000,000
Total realized/unrealized gains/(losses)	2,587,000,000	168,000,000	(60,000,000)
Interest rate derivative [Member]
Level 3 Analysis - Supplemental Data [Abstract]
Increase (decrease) in level 3 assets	(1,200,000,000)
Total realized/unrealized gains/(losses)	1,358,000,000	6,930,000,000	5,205,000,000
All Other Asset Classes [Member]
Level 3 Analysis - Supplemental Data [Abstract]
Increase (decrease) in level 3 assets	(1,100,000,000)
Total realized/unrealized gains/(losses)	98,000,000	(195,000,000)	(54,000,000)
Asset-backed AFS securities [Member]
Level 3 Analysis - Supplemental Data [Abstract]
Increase (decrease) in level 3 assets	(27,000,000,000)
Total realized/unrealized gains/(losses)	4,000,000	135,000,000	(95,000,000)
Derivative receivables [Member]
Level 3 Analysis - Supplemental Data [Abstract]
Total realized/unrealized gains/(losses)	2,963,000,000	1,138,000,000	6,068,000,000
Total debt and equity instruments [Member]
Level 3 Analysis - Supplemental Data [Abstract]
Increase (decrease) in level 3 assets	1,600,000,000
Total realized/unrealized gains/(losses)	2,237,000,000	1,251,000,000	980,000,000
Mortgage servicing rights [Member]
Level 3 Analysis - Supplemental Data [Abstract]
Increase (decrease) in level 3 assets	2,000,000,000
Total realized/unrealized gains/(losses)		(635,000,000)	(7,119,000,000)
Derivative [Member]
Level 3 Analysis - Supplemental Data [Abstract]
Increase (decrease) in level 3 assets	(3,700,000,000)
Credit derivatives [Member]
Level 3 Analysis - Supplemental Data [Abstract]
Increase (decrease) in level 3 assets	(2,700,000,000)
Total realized/unrealized gains/(losses)	(1,697,000,000)	(4,487,000,000)	2,240,000,000
Foreign exchange derivative [Member]
Level 3 Analysis - Supplemental Data [Abstract]
Increase (decrease) in level 3 assets	(1,400,000,000)
Total realized/unrealized gains/(losses)	(101,000,000)	(800,000,000)	(1,913,000,000)
Recurring [Member]
Level 3 Analysis - Supplemental Data [Abstract]
Assets fair value	760,327,000,000	882,235,000,000
Recurring [Member] | Level 3 [Member]
Level 3 Analysis - Supplemental Data [Abstract]
Assets fair value	69,310,000,000	98,123,000,000
Recurring [Member] | Mortgage servicing rights [Member]
Level 3 Analysis - Supplemental Data [Abstract]
Total realized/unrealized gains/(losses)	$ 1,612,000,000