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Acquisitions and Investments - Summary of Acquisitions (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Combinations [Abstract]      
Fair value of assets acquired, net of cash acquired $ 116 $ 406 $ 3,329
Cash paid, net of cash acquired (86) (291) (2,397)
Liabilities assumed, debt issued and noncontrolling interest 30 115 932
Excess purchase price over fair value of net assets acquired $ 56 $ 167 $ 1,903