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Goodwill and Intangible Assets (Finite-Lived Intangible Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Mar. 31, 2016
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 1,790 | $ 18
Accumulated Amortization | 16 | 7
Net Carrying Amount | 1,774 | 11
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,771 | 0
Accumulated Amortization | 7 | 0
Net Carrying Amount | 1,764 | 0
Trademarks and trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 9 | 9
Accumulated Amortization | 7 | 7
Net Carrying Amount | 2 | 2
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 10 | 9
Accumulated Amortization | 2 | 0
Net Carrying Amount | $ 8 | $ 9

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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