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Benefit Plans Contributions (Details) - USD ($) $ in Millions	6 Months Ended			12 Months Ended
	Sep. 30, 2016	Mar. 31, 2016	Mar. 31, 2015	Sep. 30, 2016	Sep. 30, 2015
Other Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Contributions		$ 138			$ 275
Other Post-retirement Benefits
Defined Benefit Plan Disclosure
Contributions		21	$ 21
Supplemental Employee Retirement Plan
Defined Benefit Plan Disclosure
Contributions		$ 6	$ 7
Scenario, Forecast | Other Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Contributions	$ 137			$ 275

X

- Definition

The increase in the fair value of plan assets from contributions made by the employer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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- Definition

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+ References

No definition available.

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