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Other Income - Schedule of Main Terms of Convertible Senior Debentures (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Other Income [Line Items]    
Gain on divestitures, net of divestitures related costs $ 93  
Section 8 and similar payments 99 $ 75
Gain on sale of assets 8  
Other, net 3 (3)
Total other income $ 203 $ 72