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Acquisitions and Investments - Summary of Acquisitions (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Combinations [Abstract]      
Fair value of assets acquired, net of cash acquired $ 357 $ 116 $ 406
Cash paid, net of cash acquired (230) (86) (291)
Liabilities assumed, debt issued and noncontrolling interest 127 30 115
Excess purchase price over fair value of net assets acquired $ 152 $ 51 $ 167