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Derivative Instruments - Schedule of Gross and Net Amount Offset (Details) - Foreign exchange contracts
$ in Millions
Mar. 31, 2018
USD ($)
Change in unrealized gain (loss) on anticipated sales hedging:  
Gross Fair Value $ (5)
Offsetting Counterparty Fair Value (5)
Net Fair Value in the Consolidated Balance Sheets 0
Counterparty A  
Change in unrealized gain (loss) on anticipated sales hedging:  
Gross Fair Value (4)
Offsetting Counterparty Fair Value (2)
Net Fair Value in the Consolidated Balance Sheets (2)
Counterparty B  
Change in unrealized gain (loss) on anticipated sales hedging:  
Gross Fair Value (2)
Offsetting Counterparty Fair Value (1)
Net Fair Value in the Consolidated Balance Sheets (1)
Counterparty C  
Change in unrealized gain (loss) on anticipated sales hedging:  
Gross Fair Value (2)
Offsetting Counterparty Fair Value (1)
Net Fair Value in the Consolidated Balance Sheets (1)
Counterparty D  
Change in unrealized gain (loss) on anticipated sales hedging:  
Gross Fair Value (3)
Offsetting Counterparty Fair Value (1)
Net Fair Value in the Consolidated Balance Sheets (2)
Counterparty E  
Change in unrealized gain (loss) on anticipated sales hedging:  
Gross Fair Value (2)
Offsetting Counterparty Fair Value (1)
Net Fair Value in the Consolidated Balance Sheets (1)
Counterparty F  
Change in unrealized gain (loss) on anticipated sales hedging:  
Gross Fair Value (10)
Offsetting Counterparty Fair Value (1)
Net Fair Value in the Consolidated Balance Sheets (9)
Counterparty G  
Change in unrealized gain (loss) on anticipated sales hedging:  
Gross Fair Value (2)
Offsetting Counterparty Fair Value 0
Net Fair Value in the Consolidated Balance Sheets $ (2)