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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance $ 971 $ 849 $ 1,707
Ending Balance 668 971 849
Available-for-sale Securities      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance 0 0 31
Other comprehensive loss before reclassifications 0 0 (5)
Amounts reclassified from AOCI 0 0 (26)
Net other comprehensive loss 0 0 (31)
Ending Balance 0 0 0
Accumulated Defined Benefit Plans Adjustment      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance (35) (29) (24)
Other comprehensive loss before reclassifications (5) (9) (8)
Amounts reclassified from AOCI 4 3 3
Net other comprehensive loss (1) (6) (5)
Ending Balance (36) (35) (29)
Foreign Currency Translation Adjustments      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance (54) (47) (11)
Other comprehensive loss before reclassifications 16 (7) (36)
Amounts reclassified from AOCI 0 0 0
Net other comprehensive loss 16 (7) (36)
Ending Balance (38) (54) (47)
AOCI Attributable to Parent      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance (89) (76) (4)
Other comprehensive loss before reclassifications 11 (16) (49)
Amounts reclassified from AOCI 4 3 (23)
Net other comprehensive loss 15 (13) (72)
Ending Balance $ (74) $ (89) $ (76)