Equity (Details 3) - USD ($) $ in Millions			3 Months Ended		9 Months Ended
	May. 27, 2015	May. 26, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Mar. 31, 2015	Dec. 31, 2014	Oct. 20, 2014	Feb. 15, 2013
Stock Repurchase Program
Amount authorized under stock repurchase program							$ 5,000		$ 5,000	$ 1,500
Shares repurchased					21,000,000	5,000,000
Aggregate reduction to stockholders' equity					$ 5,000
Increase in common stock held in treasury			$ 7,314		7,314			$ 972
Payment for shares repurchased on the open market					1,200	$ 250
Share repurchase authorization amount remaining			3,500		3,500
Changes in accumulated other comprehensive Income
Beginning balance					1,742
Other comprehensive loss			(125)	$ (493)	(468)	(471)
Ending balance			$ 4,863		4,863
Morgan Stanley & Co. LLC
Stock Repurchase Program
Amount authorized under stock repurchase program		$ 5,000
Shares repurchased	68,000,000	68,000,000	5,000,000
Percentage of initial delivery of shares		90.00%
Payment for shares repurchased on the open market		$ 5,000
Accumulated other comprehensive (loss) income
Changes in accumulated other comprehensive Income
Beginning balance					(2,031)	(442)
Other comprehensive (loss) income before reclassifications					(363)	(573)
Amounts reclassified from accumulated other comprehensive loss					105	(102)
Other comprehensive loss					(468)	(471)
Ending balance			$ (2,499)	(913)	(2,499)	(913)
Foreign currency translation adjustments
Changes in accumulated other comprehensive Income
Beginning balance					(603)	470
Other comprehensive (loss) income before reclassifications					(464)	(714)
Other comprehensive loss					(464)	(714)
Ending balance			(1,067)	(244)	(1,067)	(244)
Pension and post-employment benefits
Changes in accumulated other comprehensive Income
Beginning balance					(1,608)	(827)
Other comprehensive (loss) income before reclassifications					23
Amounts reclassified from accumulated other comprehensive loss					(68)	(43)
Other comprehensive loss					91	43
Ending balance			(1,517)	(784)	(1,517)	(784)
Unrealized gains (losses) on marketable equity securities
Changes in accumulated other comprehensive Income
Beginning balance					3	2
Other comprehensive (loss) income before reclassifications						(1)
Amounts reclassified from accumulated other comprehensive loss					4
Other comprehensive loss					(4)	(1)
Ending balance			(1)	1	(1)	1
Gains (losses) on hedging activities
Changes in accumulated other comprehensive Income
Beginning balance					177	(87)
Other comprehensive (loss) income before reclassifications					78	142
Amounts reclassified from accumulated other comprehensive loss					169	(59)
Other comprehensive loss					(91)	201
Ending balance			$ 86	$ 114	$ 86	$ 114