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Accumulated Other Comprehensive Income - Schedule of Accumulated Other Comprehensive Income (Detail)
$ in Millions
 6 Months Ended
Jun. 30, 2018
USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning balance $ 58
Adoption of accounting standard update (31)
Beginning balance, adjusted 27
Other comprehensive income before reclassifications 14
Ending balance 41
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning balance 31
Adoption of accounting standard update (31)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning balance 36
Beginning balance, adjusted 36
Ending balance 36
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning balance (26)
Beginning balance, adjusted (26)
Other comprehensive income before reclassifications 1
Ending balance (25)
Accumulated Other Comprehensive Income Loss Unrealized Gains Losses From Investments [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning balance 15
Beginning balance, adjusted 15
Other comprehensive income before reclassifications 11
Ending balance 26
Accumulated other comprehensive income loss change in unrealized gain on derivative in VIEs [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Beginning balance 2
Beginning balance, adjusted 2
Ending balance 2
Accumulated Other Comprehensive Income Loss Change In Conversion Option On Debt Facility [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Other comprehensive income before reclassifications 2
Ending balance $ 2