Quarterly report pursuant to Section 13 or 15(d)

Equity Method Investments - Summary of Consolidated Financial Position and Results of Operations of Significant Entities, Accounted for Using Equity Method (Detail)

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Equity Method Investments - Summary of Consolidated Financial Position and Results of Operations of Significant Entities, Accounted for Using Equity Method (Detail) - Strong Upwind Holdings LLC [Member] - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Schedule Of Results Related To Equity Accounted Investees [Line Items]      
Current assets $ 4   $ 3
Total assets 115   99
Current liabilities 5   4
Total liabilities 37   39
Members' equity 78   $ 60
Revenue 7 $ 6  
Income from continuing operations 3 1  
Net income $ 3 $ 1