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Investments in NonConsolidated Affiliates - Aggregate Investments and Direct Ownership in Affiliates (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Investments in and Advances to Affiliates [Line Items]          
Investments in nonconsolidated affiliates $ 266   $ 266   $ 296
Minimum Percentage of Ownership in Investments for Consolidation     50.00%    
Loss on sale of equity method investment $ 0 $ 0 $ 0 $ 11 $ 11
Minimum [Member]          
Investments in and Advances to Affiliates [Line Items]          
Direct ownership percentage 2.00%   2.00%   2.00%
Maximum [Member]          
Investments in and Advances to Affiliates [Line Items]          
Direct ownership percentage 50.00%   50.00%   50.00%