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Financial Instruments and Risk Management - Details of Securities that Currently are in Unrealized Loss Position (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]  
Less than 12 months, Fair Values   
Less than 12 months, Unrealized Losses   
More than 12 months, Fair Values 88
More than 12 months, Unrealized Losses (1)
Total, Fair Values 88
Total, Unrealized Losses (1)
Senior Debt Floating Rate Notes [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Less than 12 months, Fair Values   
Less than 12 months, Unrealized Losses   
More than 12 months, Fair Values 88
More than 12 months, Unrealized Losses (1)
Total, Fair Values 88
Total, Unrealized Losses $ (1)