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Derivative Financial Instruments Gross Notional Amounts and Fair Values for Currency Derivatives (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Mar. 31, 2019
Foreign exchange forward contracts to purchase [Member]    
Derivative Instruments and Hedging Activities Disclosures    
Fair value of foreign currency contracts outstanding, Assets $ 1 $ 0
Fair value of foreign currency contracts outstanding, Liabilities 19 10
Foreign exchange forward contracts to sell [Member]    
Derivative Instruments and Hedging Activities Disclosures    
Fair value of foreign currency contracts outstanding, Assets 61 31
Fair value of foreign currency contracts outstanding, Liabilities 1 4
Designated as Hedging Instrument [Member] | Foreign exchange forward contracts to purchase [Member]    
Derivative Instruments and Hedging Activities Disclosures    
Derivative, Notional Amount 316 295
Designated as Hedging Instrument [Member] | Foreign exchange forward contracts to sell [Member]    
Derivative Instruments and Hedging Activities Disclosures    
Derivative, Notional Amount 1,371 1,355
United States Dollar [Member] | Not Designated as Hedging Instrument [Member] | Foreign exchange forward contracts to purchase [Member]    
Derivative Instruments and Hedging Activities Disclosures    
Derivative, Notional Amount 388 449
United States Dollar [Member] | Not Designated as Hedging Instrument [Member] | Foreign exchange forward contracts to sell [Member]    
Derivative Instruments and Hedging Activities Disclosures    
Derivative, Notional Amount 292 394
Balance Sheet Hedging [Member] | Not Designated as Hedging Instrument [Member] | Foreign exchange forward contracts to purchase [Member]    
Derivative Instruments and Hedging Activities Disclosures    
Derivative Asset, Current 1 0
Derivative Liability, Current 16 2
Balance Sheet Hedging [Member] | Not Designated as Hedging Instrument [Member] | Foreign exchange forward contracts to sell [Member]    
Derivative Instruments and Hedging Activities Disclosures    
Derivative Asset, Current 13 2
Derivative Liability, Current $ 0 $ 0