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Fair Value Measurements - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
Carrying value of debt $ 9,310,000,000   $ 8,929,000,000
Net borrowings 375,000,000    
Reported Value Measurement [Member]      
Debt Instrument [Line Items]      
Carrying value of debt 9,300,000,000   8,900,000,000
Estimate of Fair Value Measurement [Member]      
Debt Instrument [Line Items]      
Fair value of debt 9,700,000,000   $ 9,200,000,000
Domestic Line of Credit [Member]      
Debt Instrument [Line Items]      
Revolving credit facility $ 2,250,000,000 $ 2,250,000,000