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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statements of Comprehensive Income [Abstract]      
Net income (loss) $ 1,235 $ 347 $ (172)
Components of other comprehensive income that will be reclassified subsequently to net income (loss)      
Currency translation differences (95) 152 (90)
Changes in fair value of derivatives designated as a cash flow hedge 0 0 (1)
Net changes of investments at fair value through other comprehensive income 0 (57) 17
Tax income (expense) relating to items that will be reclassified subsequently to net income (loss) 0 5 (5)
Total (95) 100 (79)
Components of other comprehensive income that will not be reclassified to net income (loss)      
Net changes of investments at fair value through other comprehensive income (58) 0 0
Actuarial gains (losses) from defined benefit plans 56 (17) (48)
Tax income (expense) relating to items that will not be reclassified to net income (loss) (3) 3 8
Total (5) (14) (40)
Total comprehensive income (loss) 1,135 433 (291)
Comprehensive loss attributable to the non-controlling interests (9) (13) (59)
Comprehensive income (loss) attributable to the shareholders of the Company $ 1,144 $ 446 $ (232)