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Hedging Activities - Derivative Instruments Fair Value (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Mar. 31, 2017
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Derivatives Designated for Hedge Accounting |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative, asset | $ 41 | $ 156
Fair value of derivative, liability | 132 | 0
Derivatives Designated for Hedge Accounting | Foreign Exchange Contract | Prepaid Expenses and Other |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative, asset | 13 | 17
Fair value of derivative, liability | 0 | 0
U.S. Dollar notional amount, asset | 81 | 81
Derivatives Designated for Hedge Accounting | Foreign Exchange Contract | Other Noncurrent Assets |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative, asset | 26 | 32
Fair value of derivative, liability | 0 | 0
U.S. Dollar notional amount, asset | 162 | 162
Derivatives Designated for Hedge Accounting | Cross Currency Swap | Prepaid Expenses and Other |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative, asset | 2 | 17
Fair value of derivative, liability | 0 | 0
U.S. Dollar notional amount, asset | 307 | 174
Derivatives Designated for Hedge Accounting | Cross Currency Swap | Other Noncurrent Assets |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative, asset |  | 90
Fair value of derivative, liability |  | 0
U.S. Dollar notional amount, asset |  | 2,489
Derivatives Designated for Hedge Accounting | Cross Currency Swap | Other Noncurrent Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative, asset | 0 |
Fair value of derivative, liability | 132 |
U.S. Dollar notional amount, asset | 3,036 |
Derivatives not Designated for Hedge Accounting |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative, asset | 1 | 1
Fair value of derivative, liability | 1 | 0
Derivatives not Designated for Hedge Accounting | Foreign Exchange Contract | Prepaid Expenses and Other |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative, asset | 1 | 1
Fair value of derivative, liability | 0 | 0
U.S. Dollar notional amount, asset | 46 | 198
Derivatives not Designated for Hedge Accounting | Foreign Exchange Contract | Other Accrued Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative, asset | 0 | 0
Fair value of derivative, liability | 1 | 0
U.S. Dollar, notional amount, liability | $ 21 | $ 37

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