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Commitments - Other Commitments (Detail) (USD $)
In Billions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Unrecorded Unconditional Purchase Obligation [Line Items]  
Aggregate future payments 10.4us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
Aggregate future payments expected to be paid in 2015 2.2us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary
Aggregate future payments expected to be paid in 2016 1.6us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary
Aggregate future payments expected to be paid in 2017 1.3us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary
Aggregate future payments expected to be paid in 2018 1.2us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary
Aggregate future payments expected to be paid in 2019 1.0us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary
Aggregate future payments expected to be paid thereafter 3.1us-gaap_UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears
Maximum [Member]  
Unrecorded Unconditional Purchase Obligation [Line Items]  
Other commitments, expiration date Dec. 31, 2036