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Derivative instruments (Effective Portion of Unrealized Gain (Loss)) (Details) - Cash flow hedge [Member] - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]        
Total unrealized (losses) gains $ (34) $ 17 $ 115 $ 34
Foreign currency contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Total unrealized (losses) gains 281 (203) 192 (250)
Cross-currency swap contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Total unrealized (losses) gains (315) 217 (77) 281
Forward interest rate contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Total unrealized (losses) gains $ 0 $ 3 $ 0 $ 3