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Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Comprehensive Income [Abstract]      
Net income (loss) $ 125 $ (214) $ 367
Other comprehensive (loss) income:      
Foreign currency translation adjustments (7) (36) (47)
Securities:      
Reclassification of gain to net income 0 (26) 0
Unrealized (loss) gain on securities, before tax 0 (7) 50
Tax impact on securities 0 2 (19)
Net change in securities 0 (31) 31
Defined benefit plans:      
Reclassification of loss to net income 3 3 1
Defined benefit plan adjustment, before tax (12) (9) (29)
Defined benefit plan adjustment, tax portion 3 1 7
Defined benefit plan adjustment, net of tax (6) (5) (21)
Other comprehensive loss (13) (72) (37)
Comprehensive income (loss) $ 112 $ (286) $ 330