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Debt and Commitments - Interest Expense, Net (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Interest expense      
Current $ 26us-gaap_InterestExpenseShortTermBorrowings $ 26us-gaap_InterestExpenseShortTermBorrowings $ 27us-gaap_InterestExpenseShortTermBorrowings
Long-term 21us-gaap_InterestExpenseLongTermDebt 8us-gaap_InterestExpenseLongTermDebt 7us-gaap_InterestExpenseLongTermDebt
Interest Expense, Total 47us-gaap_InterestExpense 34us-gaap_InterestExpense 34us-gaap_InterestExpense
Interest income (18)us-gaap_InterestAndOtherIncome (18)us-gaap_InterestAndOtherIncome (18)us-gaap_InterestAndOtherIncome
Interest expense, net $ 29us-gaap_InterestIncomeExpenseNonoperatingNet $ 16us-gaap_InterestIncomeExpenseNonoperatingNet $ 16us-gaap_InterestIncomeExpenseNonoperatingNet