XML 42 R30.htm IDEA: XBRL DOCUMENT v3.8.0.1
Derivative Instruments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Ineffectiveness on Foreign Currency Fair Value Hedges is Immaterial $ 0  
Senior Unsecured Notes 3.375% due 2024    
Debt instrument, face amount 600  
Foreign Exchange Contract    
Notional Amount 5,186 $ 5,871
Designated as Hedging Instrument | Foreign Exchange Contract    
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months 3 7
Notional Amount 833 $ 1,104
Designated as Hedging Instrument | Interest rate swap liability    
Derivative, terminated notional amount 600  
Notional Amount $ 500