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Income Taxes - Reconciliation of Expected Income Tax Expense at Federal Statutory Rate of 35 Percent to Company's Applicable Income Tax Expense (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Income Tax Disclosure [Abstract]        
Tax at statutory rate $ 719 $ 690 $ 1,387 $ 1,371
State income tax, at statutory rates, net of federal tax benefit 58 4 101 40
Tax effect of        
Tax credits and benefits, net of related expenses (184) (112) (349) (218)
Tax-exempt income (51) (53) (103) (107)
Noncontrolling interests (5) 15 (10) 29
Other items 10 (15) 17 (28)
Applicable income taxes $ 547 $ 529 $ 1,043 $ 1,087