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Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

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Increase for accrued, but unpaid interest on the debt instrument for the period.

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Interest rate stated in the contractual debt agreement.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Date the credit facility terminates, in CCYY-MM-DD format.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The excess of the (1) fair value of consideration transferred to the holders of a security in excess of (2) the carrying amount of the security reported on the registrant's balance sheet, which will be deducted from net earnings to derive net earnings available to common shareholders. This amount is generally an adjustment considered in the computation of earnings per share.

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Carrying value, as of the balance sheet date, of securities sold under agreements to repurchase where the transferor maintains effective control over the assets, accounting for them as secured debt.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, the maximum amount borrowed at any time during the period.

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Debt (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended							3 Months Ended			9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013 Pollution Control Bonds Series 1996 C, E, F, And 1997 B [Member]	Sep. 30, 2013 Pollution Control Bonds Series 2009 A-D [Member]	Sep. 30, 2013 Minimum [Member] Pollution Control Bonds Series 1996 C, E, F, And 1997 B [Member]	Sep. 30, 2013 Minimum [Member] Pollution Control Bonds Series 2009 A-D [Member]	Sep. 30, 2013 Maximum [Member] Pollution Control Bonds Series 1996 C, E, F, And 1997 B [Member]	Sep. 30, 2013 Maximum [Member] Pollution Control Bonds Series 2009 A-D [Member]	Sep. 30, 2013 Utility [Member]	Jun. 14, 2013 Utility [Member] Due June 15 2023 [Member]	Jun. 14, 2013 Utility [Member] Due June 15 2043 [Member]	Sep. 30, 2013 Utility [Member] Due March 1 2014 [Member]	Jun. 14, 2013 Utility [Member] Due March 1 2014 [Member]
Debt [Line Items]
Line of Credit termination date	Apr. 01, 2018							Apr. 01, 2018
Line of credit facility, maximum borrowing capacity	$ 300							$ 3,000
Letters of credit outstanding	0							91
Debt instrument, interest rate				0.05%	0.01%	0.07%	0.04%		3.25%	4.60%		4.80%
Debt instrument, face amount		614	309
Senior Notes									375	375		1,000
Secured Debt Repurchase Agreements												461
Commercial paper outstanding								693
Short term borrowing outstanding	260							0
Premium											15
Accrued interest											$ 6