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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Net income $ 1,360 $ 1,225 $ 4,365 $ 3,788
Investment securities, available-for-sale:        
Net unrealized (loss) gain (30) (10) (2) 40
Income tax effect 11 1 1 (16)
Reclassification adjustment for net gain realized in net income          (1)
Defined benefit pension and other postretirement plans:        
Net unrealized actuarial loss and prior service credit    (1) (7) (4)
Income tax effect       3 1
Amortization of actuarial loss (gain) and prior service credit realized in net income    4 (7) 12
Income tax effect    (1) 3 (4)
Derivative instruments classified as cash flow hedges:        
Net unrealized (loss) gain (14) 40 3 55
Income tax effect 3 (9)    (9)
Reclassification adjustment for net gain realized in net income (16) (9) (39) (26)
Income tax effect 4 2 8 7
Other comprehensive (loss) income, net of tax (42) 17 (37) 55
Comprehensive income $ 1,318 $ 1,242 $ 4,328 $ 3,843