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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Available-for-sale Securities      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance $ 0 $ 31 $ 0
Other comprehensive income (loss) before reclassifications 0 (5) 31
Amounts reclassified from AOCI 0 (26) 0
Net other comprehensive loss 0 (31) 31
Ending Balance 0 0 31
Accumulated Defined Benefit Plans Adjustment      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance (29) (24) (3)
Other comprehensive income (loss) before reclassifications (9) (8) (22)
Amounts reclassified from AOCI 3 3 1
Net other comprehensive loss (6) (5) (21)
Ending Balance (35) (29) (24)
Foreign Currency Translation Adjustments      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance (47) (11) 36
Other comprehensive income (loss) before reclassifications (7) (36) (47)
Amounts reclassified from AOCI 0 0 0
Net other comprehensive loss (7) (36) (47)
Ending Balance (54) (47) (11)
AOCI Attributable to Parent      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance (76) (4) 33
Other comprehensive income (loss) before reclassifications (16) (49) (38)
Amounts reclassified from AOCI 3 (23) 1
Net other comprehensive loss (13) (72) (37)
Ending Balance $ (89) $ (76) $ (4)