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Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Parenthetical) (Detail)
$ in Millions
6 Months Ended
Jun. 30, 2017
USD ($)
Derivative Instruments [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Other comprehensive income, tax $ 0
Amounts reclassified from accumulated other comprehensive loss, tax 2
Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Other comprehensive income, tax 1
Amounts reclassified from accumulated other comprehensive loss, tax 0
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Other comprehensive income, tax 0
Amounts reclassified from accumulated other comprehensive loss, tax 0
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Other comprehensive income, tax 0
Amounts reclassified from accumulated other comprehensive loss, tax $ 0