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Accounting Policies - Schedule of Impact on Company's Previously Issued Unaudited Consolidated Balance Sheets (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011	Jun. 30, 2013 Scenario, Previously Reported [Member]	Mar. 31, 2013 Scenario, Previously Reported [Member]	Dec. 31, 2012 Scenario, Previously Reported [Member]	Sep. 30, 2012 Scenario, Previously Reported [Member]	Jun. 30, 2012 Scenario, Previously Reported [Member]	Mar. 31, 2012 Scenario, Previously Reported [Member]	Dec. 31, 2011 Scenario, Previously Reported [Member]	Jun. 30, 2013 Restatement Adjustment [Member]	Mar. 31, 2013 Restatement Adjustment [Member]	Dec. 31, 2012 Restatement Adjustment [Member]	Sep. 30, 2012 Restatement Adjustment [Member]	Jun. 30, 2012 Restatement Adjustment [Member]	Mar. 31, 2012 Restatement Adjustment [Member]	Dec. 31, 2011 Restatement Adjustment [Member]
Cash and cash investments	$ 1,011	$ 1,040	$ 889	$ 1,353	$ 1,223	$ 1,032	$ 1,351	$ 1,166	$ 1,853	$ 1,788	$ 1,656	$ 1,028	$ 828	$ 1,040	$ 889	$ 1,612	$ 1,491	$ 1,353
Short-term bank deposits	277	311												311				303
Total current assets	$ 3,493	$ 3,217					$ 3,217				$ 3,429			$ 3,217				$ 3,429

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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