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Debt (Narrative - Senior Credit Facilities) (Details) $ in Millions	9 Months Ended
	Dec. 31, 2016 USD ($) reduction	Dec. 08, 2016 USD ($)	Dec. 07, 2016 USD ($)	Mar. 31, 2016
Line of Credit Facility [Abstract]
Term loan B facility, initial issuance price, percentage		99.50%
Revolving Credit Facility
Line of Credit Facility [Abstract]
Revolving credit facility, maximum borrowing capacity	$ 1,000	$ 1,000	$ 800
Debt instrument, term	5 years
Revolving credit facility, available amount	$ 1,000
Number of possible reductions in margin | reduction	2
Effective interest rate	3.19%			2.94%
Change in control, trigger percentage	50.00%
Letter of Credit
Line of Credit Facility [Abstract]
Letters of credit outstanding, amount	$ 0
Minimum | Revolving Credit Facility
Line of Credit Facility [Abstract]
Revolving credit facility, commitment fee annual percentage	0.25%
Maximum | Revolving Credit Facility
Line of Credit Facility [Abstract]
Revolving credit facility, commitment fee annual percentage	0.375%
Base Rate | Revolving Credit Facility
Line of Credit Facility [Abstract]
Basis spread on variable interest rate	1.50%
LIBOR | Revolving Credit Facility
Line of Credit Facility [Abstract]
Basis spread on variable interest rate	2.50%
Potential reduction in interest rate if certain leverage ratios are met, total	0.50%
Potential reduction in interest rate if certain leverage ratios are met, per reduction	0.25%
Term Loan A Facility | Term Loan
Line of Credit Facility [Abstract]
Principal amount issued		1,000
Debt instrument, term	5 years
Number of possible reductions in margin | reduction	2
Effective interest rate	3.19%
Quarterly principal payment percent, year one	1.25%
Quarterly principal payment percent, year two	1.25%
Quarterly principal payment percent, year three	1.75%
Quarterly principal payment percent, year four	2.50%
Quarterly principal payment percent, year five	2.50%
Term Loan A Facility | Base Rate | Term Loan
Line of Credit Facility [Abstract]
Basis spread on variable interest rate	1.50%
Term Loan A Facility | LIBOR | Term Loan
Line of Credit Facility [Abstract]
Basis spread on variable interest rate	2.50%
Potential reduction in interest rate if certain leverage ratios are met, total	0.50%
Potential reduction in interest rate if certain leverage ratios are met, per reduction	0.25%
Term Loan B Facility | Term Loan
Line of Credit Facility [Abstract]
Principal amount issued		$ 2,000
Debt instrument, term	7 years
Effective interest rate	3.75%
Quarterly principal payment percent	0.25%
Prepayment premium percent	1.00%
Term Loan B Facility | Base Rate | Term Loan
Line of Credit Facility [Abstract]
Basis spread on variable interest rate	2.00%
Term Loan B Facility | LIBOR | Term Loan
Line of Credit Facility [Abstract]
Basis spread on variable interest rate	3.00%
Term Loan B Facility | LIBOR | Minimum | Term Loan
Line of Credit Facility [Abstract]
Coupon rate	0.75%

X

- Definition

Trigger for change in control for purposes of senior revolving credit facility, as a percentage

+ References

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- Definition

The initial issuance price at which a debt instrument was offered, stated as a percentage.

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Debt Instrument, Interest Rate, Potential Reductions in Interest Rate

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- Definition

Debt Instrument, Periodic Payment, Quarterly Principal Payments, Year Five

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Debt Instrument, Periodic Payment, Quarterly Principal Payments, Year Four

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Debt Instrument, Periodic Payment, Quarterly Principal Payments, Year One

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Debt Instrument, Periodic Payment, Quarterly Principal Payments, Year Three

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Debt Instrument, Periodic Payment, Quarterly Principal Payments, Year Two

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Debt Instrument, Prepayment Premium

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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-Publisher FASB
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-SubTopic 10
-Section S99
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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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- Definition

The effective interest rate at the end of the reporting period.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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