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Accumulated Other Comprehensive (Loss) Income - Changes in Accumulated Other Comprehensive Income (AOCI) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance $ (4) $ 33 $ 29
Other comprehensive income (loss) before reclassifications (49) (38) 2
Amounts reclassified from AOCI (23) 1 2
Net other comprehensive income (loss) (72) (37) 4
Ending Balance (76) (4) 33
Available-for-sale Securities      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance 31 0 0
Other comprehensive income (loss) before reclassifications (5) 31 0
Amounts reclassified from AOCI (26) 0 0
Net other comprehensive income (loss) (31) 31 0
Ending Balance 0 31 0
Accumulated Defined Benefit Plans Adjustment      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance (24) (3) (5)
Other comprehensive income (loss) before reclassifications (8) (22) 0
Amounts reclassified from AOCI 3 1 2
Net other comprehensive income (loss) (5) (21) 2
Ending Balance (29) (24) (3)
Foreign Currency Translation Adjustments      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance (11) 36 34
Other comprehensive income (loss) before reclassifications (36) (47) 2
Amounts reclassified from AOCI 0 0 0
Net other comprehensive income (loss) (36) (47) 2
Ending Balance $ (47) $ (11) $ 36