2.2.0.7falsePurchase Obligations (Detail) (USD $)171 - Disclosure - Purchase Obligations (Detail)truefalseIn Millionsfalsefalse1USDfalsefalseiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170pureStandardhttp://www.xbrl.org/2003/instancepure0iso4217_USD_per_sharesDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instanceshares0sharesStandardhttp://www.xbrl.org/2003/instanceshares0$53us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversaryus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalsefalse896000000896falsefalsefalsexbrli:monetaryItemTypemonetaryThe remaining amount of the fixed and determinable portion of an unrecorded unconditional purchase obligation on the first anniversary of the balance sheet date.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 47
-Paragraph 7
-Subparagraph b
false63us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversaryus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruefalsefalse568000000568falsefalsefalsexbrli:monetaryItemTypemonetaryThe remaining amount of the fixed and determinable portion of an unrecorded unconditional purchase obligation on the second anniversary of the balance sheet date.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 47
-Paragraph 7
-Subparagraph b
false73us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversaryus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsetruefalsefalse528000000528falsefalsefalsexbrli:monetaryItemTypemonetaryThe remaining amount of the fixed and determinable portion of an unrecorded unconditional purchase obligation on the third anniversary of the balance sheet date.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 47
-Paragraph 7
-Subparagraph b
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 47
-Paragraph 7
-Subparagraph b
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 47
-Paragraph 7
-Subparagraph b
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