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Derivatives and Other Financial Instruments - Schedule of Carrying Values and Fair Values of Other Financial Instruments (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Cash and cash equivalents [Member]
Derivative [Line Items]
Carrying value	$ 1,555	$ 1,861
Fair value	1,555	1,861
Restricted cash [Member]
Derivative [Line Items]
Carrying value	130	189
Fair value	130	189
Noncurrent receivables [Member]
Derivative [Line Items]
Carrying value	20	20
Fair value	20	20
Available-for-sale securities [Member]
Derivative [Line Items]
Carrying value	79	67
Fair value	79	67
Short-term borrowings [Member]
Derivative [Line Items]
Carrying value	51	53
Fair value	51	53
Commercial paper [Member]
Derivative [Line Items]
Carrying value	104
Fair value	104
Long-term debt due within one year [Member]
Derivative [Line Items]
Carrying value	1,025	465
Fair value	1,266	477
Long-term debt, less amount due within one year [Member]
Derivative [Line Items]
Carrying value	7,745	8,311
Fair value	$ 8,302	$ 9,028

The aggregate fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings.

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