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Accounting Policies - Schedule of Impact on Company's Previously Issued Unaudited Consolidated 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
Sep. 30, 2013
Sep. 30, 2012
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]
Net cash (for) investing activities $ (21) $ (17) $ (30) $ (2) $ (51) $ (15) $ (42) $ (27) $ (61) $ (109) $ 70 $ 10 $ 62 $ 37 $ (17) $ (29) $ (84) $ (244)
Effect of exchange rate changes on cash and cash investments (2) 11           17 (18) (14)           11 (8) (7)
Decrease in cash and cash investments $ (29) $ (464)           $ (305) $ (59) $ 302           $ (313) $ (72) $ 174