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Marketable Securities - Changes in Value of Marketable Securities Reported in Current Assets on Consolidated Balance Sheets (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items] |  |  |
Beginning Balance | $ 57us-gaap_MarketableSecurities | $ 238us-gaap_MarketableSecurities |
Purchase | 333us-gaap_PaymentsToAcquireMarketableSecurities |  | 450us-gaap_PaymentsToAcquireMarketableSecurities
Sale | (58)us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities | (184)us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities | (630)us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities
Change in fair value included in OCI for available-for-sale marketable securities | 1us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLoss |  |
Change in fair value recognized in earnings | 0us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet | 0us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet |
Foreign exchange result through OCI | 1us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax | 3us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax |
Ending Balance | 334us-gaap_MarketableSecurities | 57us-gaap_MarketableSecurities | 238us-gaap_MarketableSecurities
U.S.Treasury Bonds [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Purchase | 333us-gaap_PaymentsToAcquireMarketableSecurities / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryBondSecuritiesMember |  |
Change in fair value included in OCI for available-for-sale marketable securities | 1us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLoss / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryBondSecuritiesMember |  |
Change in fair value recognized in earnings | 0us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryBondSecuritiesMember |  |
Ending Balance | 334us-gaap_MarketableSecurities / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryBondSecuritiesMember |  |
Corporate Bonds [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Beginning Balance | 57us-gaap_MarketableSecurities / us-gaap_InvestmentTypeAxis = us-gaap_CorporateBondSecuritiesMember | 88us-gaap_MarketableSecurities / us-gaap_InvestmentTypeAxis = us-gaap_CorporateBondSecuritiesMember |
Sale | (58)us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities / us-gaap_InvestmentTypeAxis = us-gaap_CorporateBondSecuritiesMember | (34)us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities / us-gaap_InvestmentTypeAxis = us-gaap_CorporateBondSecuritiesMember |
Change in fair value recognized in earnings | 0us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet / us-gaap_InvestmentTypeAxis = us-gaap_CorporateBondSecuritiesMember | 0us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet / us-gaap_InvestmentTypeAxis = us-gaap_CorporateBondSecuritiesMember |
Foreign exchange result through OCI | 1us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_CorporateBondSecuritiesMember | 3us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_CorporateBondSecuritiesMember |
Ending Balance |  | 57us-gaap_MarketableSecurities / us-gaap_InvestmentTypeAxis = us-gaap_CorporateBondSecuritiesMember |
U.S. Treasury Bills [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Beginning Balance |  | 150us-gaap_MarketableSecurities / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryBillSecuritiesMember |
Sale |  | (150)us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryBillSecuritiesMember |
Change in fair value recognized in earnings |  | $ 0us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryBillSecuritiesMember |

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- Definition This item represents the pretax change in net unrealized holding gain (loss) on available-for-sale securities that has been included in accumulated other comprehensive income, a separate component of shareholders' equity, during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount before tax, after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 35 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6939497&loc=d3e30304-110892 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b,d) -URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32211-110900 + Details
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- Definition Cash outflow for purchase of trading, available-for-sale securities and held-to-maturity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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