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Summary Financial Information for Equity Method Investments (Parenthetical) (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Jul. 02, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]                          
After-tax equity method investment net earnings $ 224 $ 103 $ 67 $ 66 $ 83 $ 31 $ 102 $ 85     $ 460 $ 301 $ 0
Operating income                     3,506 2,569 $ 8,897
Maximum                          
Schedule of Equity Method Investments [Line Items]                          
After-tax equity method investment net earnings                 $ 1        
Equity Method Investments                          
Schedule of Equity Method Investments [Line Items]                          
Operating income                   $ 56      
US GAAP basis difference from equity method investments                          
Schedule of Equity Method Investments [Line Items]                          
Basis Differences                     $ 360 $ 360