CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Net income	$ 1,407	$ 1,293
Investment securities, available-for-sale:
Net unrealized gain	17	48
Income tax effect	(6)	(17)
Defined benefit pension and other postretirement plans:
Net unrealized actuarial gain and prior service credit	1
Amortization of actuarial (gain) loss and prior service credit realized in net income	(2)	3
Income tax effect	1	(1)
Derivative instruments classified as cash flow hedges:
Net unrealized gain	24	9
Income tax effect	(4)
Reclassification adjustment for net gain realized in net income	(11)	(11)
Income tax effect	2	3
Other comprehensive income, net of tax	22	34
Comprehensive income	$ 1,429	$ 1,327