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Accounting for Derivatives - Interest Rate Risk (Details) - Derivatives designated as hedging instruments: $ in Millions	Mar. 31, 2017 USD ($)
Interest rate swaps
Notional Disclosures
Notional amount of interest rate swaps	$ 500
Expiring In May 2018
Notional Disclosures
Notional amount of interest rate swaps	300
Expiring In May 2019
Notional Disclosures
Notional amount of interest rate swaps	100
Expiring In May 2020
Notional Disclosures
Notional amount of interest rate swaps	$ 100

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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Namespace Prefix:	invest_
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Period Type:	instant

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- References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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- Details

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