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Book Values and Fair Values of Financial Instruments (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]    
Long-term debt and lease obligations [1] $ 2,779 $ 3,922
Book Values    
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]    
Investments 31 21
Short-term debt   1,775
Current maturities of long-term debt and lease obligations 3 810
Long-term debt and lease obligations 2,779 3,922
Approximate fair values    
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]    
Investments 31 21
Short-term debt   1,775
Current maturities of long-term debt and lease obligations 3 818
Long-term debt and lease obligations $ 2,756 $ 4,077
[1] Book values include any discounts, premiums and adjustments related to hedging instruments.