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Retirement Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Mar. 31, 2013	Jun. 30, 2013
Compensation And Retirement Disclosure [Abstract]
Reduction of accrued benefit plan liabilities and pre-tax unrecognized actuarial losses	$ 245	$ 245
Estimated pension expense for 2013		80
Estimated amortization of unrecognized net actuarial losses for 2013		60
Budgeted contributions to funded pension plans in 2013		140
Corporation contributed to its pension plans		$ 70

Before tax amount of the gain (loss) adjustment to other comprehensive income (loss) resulting from the settlement or curtailment of the entity's defined benefit pension and other postretirement plans.

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