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Derivative instruments (Locations and Effective Portions of Gain (Loss) Reclassified out of AOCI) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]        
Interest and other income, net $ 126 $ 267 $ 519 $ 627
Interest expense, net (355) (325) (1,040) (972)
Income before income taxes 2,094 2,381 7,360 7,383
Product sales [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Product sales 5,510 5,453 16,532 16,226
Accumulated net gain (loss) from cash flow hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Income before income taxes (33) 140 (221) 601
Accumulated net gain (loss) from cash flow hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Foreign currency contracts [Member] | Product sales [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Product sales 3   (51)  
Accumulated net gain (loss) from cash flow hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Cross-currency swap contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Interest and other income, net (36)   (170)  
Accumulated net gain (loss) from cash flow hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Cash flow hedge [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Income before income taxes (33) 140 (221) 601
Accumulated net gain (loss) from cash flow hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Cash flow hedge [Member] | Foreign currency contracts [Member] | Product sales [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Product sales 3 (2) (51) 88
Accumulated net gain (loss) from cash flow hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Cash flow hedge [Member] | Cross-currency swap contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Interest and other income, net (36) 143 (170) 514
Accumulated net gain (loss) from cash flow hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Cash flow hedge [Member] | Forward interest rate contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Interest expense, net $ 0 $ (1) $ 0 $ (1)