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Revision of Previously Issued Financial Statements - Schedule of Impact on Company's Previously Issued Unaudited Consolidated Balance Sheets and Statements of Cash Flows (Detail) (USD $) In Millions, unless otherwise specified | 9 Months Ended |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Mar. 31, 2013 Scenario, Previously Reported [Member] | Mar. 31, 2012 Scenario, Previously Reported [Member] | Jun. 30, 2013 Scenario, Previously Reported [Member] | Jun. 30, 2012 Scenario, Previously Reported [Member] | Sep. 30, 2012 Scenario, Previously Reported [Member] | Dec. 31, 2012 Scenario, Previously Reported [Member] | Dec. 31, 2011 Scenario, Previously Reported [Member] | Dec. 31, 2010 Scenario, Previously Reported [Member] | Mar. 31, 2013 Restatement Adjustment [Member] | Mar. 31, 2012 Restatement Adjustment [Member] | Jun. 30, 2013 Restatement Adjustment [Member] | Jun. 30, 2012 Restatement Adjustment [Member] | Sep. 30, 2012 Restatement Adjustment [Member] | Dec. 31, 2012 Restatement Adjustment [Member] | Dec. 31, 2011 Restatement Adjustment [Member] | Dec. 31, 2010 Restatement Adjustment [Member]
Cash and cash investments | $ 1,011 | $ 889 | $ 1,040 | $ 1,353 | $ 1,032 | $ 1,788 | $ 1,223 | $ 1,853 | $ 1,166 | $ 1,351 | $ 1,656 |  | $ 828 | $ 1,491 | $ 1,028 | $ 1,612 | $ 889 | $ 1,040 | $ 1,353 |
Short-term bank deposits |  |  |  |  |  |  |  |  |  |  |  |  | 204 | 297 | 195 | 241 | 277 |  |  |
Net cash (for) from investing activities | $ (21) | $ (17) |  |  | $ (30) | $ (2) | $ (51) | $ (15) | $ (42) | $ (27) | $ (61) | $ (109) | $ 70 | $ 10 | $ 62 | $ 37 | $ (17) | $ (29) | $ (84) | $ (244)

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3574-108585 + Details
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