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Other Impairments, Restructuring and Other Items - Summary of Impairments, Restructuring and Others (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]        
Restructuring expenses $ 88 $ 72 $ 442 $ 300
Integration and acquisition expenses 4 31 9 87
Contingent consideration 29 18 84 179
Impairments of long-lived assets 521 408 1,501 564
Other 16 21 44 79
Total $ 658 $ 550 $ 2,080 $ 1,209