Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Debt - Additional Information (Detail) (USD $)	12 Months Ended		0 Months Ended	12 Months Ended					3 Months Ended
Debt - Additional Information (Detail) (USD $)	Dec. 31, 2012	Nov. 30, 2012	Nov. 06, 2012 Fixed Rate Notes	Dec. 31, 2012 Multi-Year Facility Expiring July 2013	Dec. 31, 2012 Multi-Year Facility, Expiring July 2016	Dec. 31, 2012 Commercial Paper	Dec. 31, 2012 Commercial Paper Multi-Year Facility Expiring July 2013	Dec. 31, 2012 Commercial Paper Multi-Year Facility, Expiring July 2016	Dec. 31, 2012 First Periodic Payment Fixed Rate Notes	Dec. 31, 2012 Second Periodic Payment Fixed Rate Notes	Dec. 31, 2012 Third Periodic Payment Fixed Rate Notes
Debt Outstanding [Line Items]
Issued fixed-rate notes			$ 2,400,000,000
Fixed-rate notes incremental payments									900,000,000	1,000,000,000	500,000,000
Weighted-average interest rate on outstanding debt	2.20%	3.90%
Weighted-average maturity on outstanding debt	9 years 6 months	2 years 7 months 6 days
Pretax loss on redemption of previously-issued fixed-rate notes			123,000,000
Percentage of owned subsidiaries guaranteed	100.00%					100.00%
Credit facilities						$ 2,000,000,000	$ 1,000,000,000	$ 1,000,000,000
Line of credit facility, expiration date				2013-07	2016-07