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Debt (Schedule of Debt Repayments and Redemptions) (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Mar. 31, 2016
Debt Instrument, Redemption [Line Items] |  |
Previously incurred unamortized net discount/premium and unamortized debt issuance costs of redeemed debt | $ 1 | $ 0
Senior Secured Second-Priority Notes |  |
Debt Instrument, Redemption [Line Items] |  |
Total debt issuance and redemption costs | 128 |
Senior Secured Second-Priority Notes | Term Loan Due 2022 & 5.25% Senior Notes |  |
Debt Instrument, Redemption [Line Items] |  |
Early redemption/ call premium on redeemed debt and other fees paid to creditors | 23 |
Previously incurred unamortized net discount/premium and unamortized debt issuance costs of redeemed debt | 13 |
Total costs associated with redeemed debt | 36 |
New costs incurred to issue the 5.875% Senior Notes, Term Loan A and Term Loan B | 92 |
Revolving Credit Facility |  |
Debt Instrument, Redemption [Line Items] |  |
Previously incurred unamortized net discount/premium and unamortized debt issuance costs of redeemed debt | 3 |
New costs incurred to issue the new revolving credit facility | 20 |
Total debt issuance and redemption costs | 23 |
Debt Issuance Costs Call Premium and Unamortized Discount | Senior Secured Second-Priority Notes |  |
Debt Instrument, Redemption [Line Items] |  |
Total debt issuance and redemption costs | 104 |
Debt Issuance Costs Call Premium and Unamortized Discount | Senior Secured Second-Priority Notes | Term Loan Due 2022 & 5.25% Senior Notes |  |
Debt Instrument, Redemption [Line Items] |  |
Early redemption/ call premium on redeemed debt and other fees paid to creditors | 11 |
Previously incurred unamortized net discount/premium and unamortized debt issuance costs of redeemed debt | 9 |
Total costs associated with redeemed debt | 20 |
New costs incurred to issue the 5.875% Senior Notes, Term Loan A and Term Loan B | 84 |
Debt Issuance Costs Call Premium and Unamortized Discount | Revolving Credit Facility |  |
Debt Instrument, Redemption [Line Items] |  |
Previously incurred unamortized net discount/premium and unamortized debt issuance costs of redeemed debt | 2 |
New costs incurred to issue the new revolving credit facility | 20 |
Total debt issuance and redemption costs | 22 |
Loss on Extinguishment of Debt | Senior Secured Second-Priority Notes |  |
Debt Instrument, Redemption [Line Items] |  |
Total debt issuance and redemption costs | 24 |
Loss on Extinguishment of Debt | Senior Secured Second-Priority Notes | Term Loan Due 2022 & 5.25% Senior Notes |  |
Debt Instrument, Redemption [Line Items] |  |
Early redemption/ call premium on redeemed debt and other fees paid to creditors | 12 |
Previously incurred unamortized net discount/premium and unamortized debt issuance costs of redeemed debt | 4 |
Total costs associated with redeemed debt | 16 |
New costs incurred to issue the 5.875% Senior Notes, Term Loan A and Term Loan B | 8 |
Loss on Extinguishment of Debt | Revolving Credit Facility |  |
Debt Instrument, Redemption [Line Items] |  |
Previously incurred unamortized net discount/premium and unamortized debt issuance costs of redeemed debt | 1 |
New costs incurred to issue the new revolving credit facility | 0 |
Total debt issuance and redemption costs | $ 1 |

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