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Shareholders' Equity (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Accumulated other comprehensive income (loss)    
Balance of Accumulated Other Comprehensive Income (Loss) at beginning of period $ (2,598)  
Balance of Accumulated Other Comprehensive Income (Loss) at End of period (1,637) $ (2,598)
Foreign Currency Translation Adjustment [Member]    
Accumulated Other Comprehensive Income [Line Items]    
Other Comprehensive Income (Loss), before Reclassifications, before Tax 690 (391)
Accumulated other comprehensive income (loss)    
Balance of Accumulated Other Comprehensive Income (Loss) at beginning of period (2,102) (1,626)
Net realized gains (losses) 0 (75)
Other Comprehensive Income (Loss), Tax 59 (10)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 749 (476)
Balance of Accumulated Other Comprehensive Income (Loss) at End of period (1,353) (2,102)
Deferred Gain (Loss) On Hedging Activities [Member]    
Accumulated Other Comprehensive Income [Line Items]    
Other Comprehensive Income (Loss), before Reclassifications, before Tax (35) (104)
Accumulated other comprehensive income (loss)    
Balance of Accumulated Other Comprehensive Income (Loss) at beginning of period 6 (15)
Net realized gains (losses) 47 137
Other Comprehensive Income (Loss), Tax (1) (12)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 11 21
Balance of Accumulated Other Comprehensive Income (Loss) at End of period 17 6
Pension Liability Adjustment [Member]    
Accumulated Other Comprehensive Income [Line Items]    
Other Comprehensive Income (Loss), before Reclassifications, before Tax 243 (28)
Accumulated other comprehensive income (loss)    
Balance of Accumulated Other Comprehensive Income (Loss) at beginning of period (521) (523)
Net realized gains (losses) 55 27
Other Comprehensive Income (Loss), Tax (98) 3
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 200 2
Balance of Accumulated Other Comprehensive Income (Loss) at End of period (321) (521)
Unrealized Gain (Loss) On Investments [Member]    
Accumulated Other Comprehensive Income [Line Items]    
Other Comprehensive Income (Loss), before Reclassifications, before Tax 0 (3)
Accumulated other comprehensive income (loss)    
Balance of Accumulated Other Comprehensive Income (Loss) at beginning of period 19 18
Net realized gains (losses) (1) 6
Other Comprehensive Income (Loss), Tax 2 (2)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 1 1
Balance of Accumulated Other Comprehensive Income (Loss) at End of period 20 19
Accumulated Other Comprehensive Income (Loss) [Member]    
Accumulated Other Comprehensive Income [Line Items]    
Other Comprehensive Income (Loss), before Reclassifications, before Tax 898 (526)
Accumulated other comprehensive income (loss)    
Balance of Accumulated Other Comprehensive Income (Loss) at beginning of period (2,598) (2,146)
Net realized gains (losses) 101 95
Other Comprehensive Income (Loss), Tax (38) (21)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 961 (452)
Balance of Accumulated Other Comprehensive Income (Loss) at End of period $ (1,637) $ (2,598)