Consolidated Statement of Comprehensive Income (loss) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net income	$ 4,012	$ 2,463	$ 5,495	$ 3,116
Other comprehensive income, net-of-tax:
Net change in available-for-sale debt and marketable equity securities	(4,233)	1,530	(5,139)	606
Net change in derivatives	13	(81)	185	301
Employee benefit plan adjustments	48	79	133	1,031
Net change in foreign currency translation adjustments	(49)	(32)	(91)	(1)
Other comprehensive income	(4,221)	1,496	(4,912)	1,937
Comprehensive income (loss)	$ (209)	$ 3,959	$ 583	$ 5,053