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Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Carrying value of debt $ 9,596 $ 8,929
Net borrowings 654  
Reported Value Measurement [Member]    
Debt Instrument [Line Items]    
Carrying value of debt 9,600 8,900
Estimate of Fair Value Measurement [Member]    
Debt Instrument [Line Items]    
Fair value of debt $ 10,100 $ 9,200