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Accumulated Other Comprehensive Loss - Summary of Components of Accumulated Other Comprehensive Loss (Detail)
$ in Millions
6 Months Ended
Jun. 30, 2016
USD ($)
Accumulated other comprehensive loss, Beginning balance $ 1,403
Other comprehensive gain 15
Accumulated other comprehensive loss, Ending balance 1,322
Accumulated Other Comprehensive Loss [Member]  
Accumulated other comprehensive loss, Beginning balance (134)
Accumulated other comprehensive loss, Ending balance $ (119)