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Pension Benefits - Summary Of Pension Plan Assets Using Fair Value Hierarchy By Asset Class (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
--- | --- | --- | ---
U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 293 | $ 262 | $ 298
U.S. Plans | Total |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 293 | 262 |
Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 623 | 607 | $ 612
Non-U.S. Plans | Total |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 623 | 607 |
Investment Assets at Fair Value | U.S. Plans | Total |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 93 | 80 |
Investment Assets at Fair Value | U.S. Plans | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 8 | 4 |
Investment Assets at Fair Value | U.S. Plans | Common and preferred stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 17 | 16 |
Investment Assets at Fair Value | U.S. Plans | Equity commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | U.S. Plans | Government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 27 | 12 |
Investment Assets at Fair Value | U.S. Plans | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 12 | 12 |
Investment Assets at Fair Value | U.S. Plans | Mortgage-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 10 | 14 |
Investment Assets at Fair Value | U.S. Plans | Asset-backed securities and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 19 | 22 |
Investment Assets at Fair Value | U.S. Plans | Fixed income commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | U.S. Plans | Real estate funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | U.S. Plans | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | U.S. Plans | Level 1 | Total |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 25 | 20 |
Investment Assets at Fair Value | U.S. Plans | Level 1 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 8 | 4 |
Investment Assets at Fair Value | U.S. Plans | Level 1 | Common and preferred stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 17 | 16 |
Investment Assets at Fair Value | U.S. Plans | Level 1 | Equity commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | U.S. Plans | Level 1 | Government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | U.S. Plans | Level 1 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | U.S. Plans | Level 1 | Mortgage-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | U.S. Plans | Level 1 | Asset-backed securities and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | U.S. Plans | Level 1 | Fixed income commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | U.S. Plans | Level 1 | Real estate funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | U.S. Plans | Level 1 | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | U.S. Plans | Level 2 | Total |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 68 | 60 |
Investment Assets at Fair Value | U.S. Plans | Level 2 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | U.S. Plans | Level 2 | Common and preferred stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | U.S. Plans | Level 2 | Equity commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | U.S. Plans | Level 2 | Government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 27 | 12 |
Investment Assets at Fair Value | U.S. Plans | Level 2 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 12 | 12 |
Investment Assets at Fair Value | U.S. Plans | Level 2 | Mortgage-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 10 | 14 |
Investment Assets at Fair Value | U.S. Plans | Level 2 | Asset-backed securities and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 19 | 22 |
Investment Assets at Fair Value | U.S. Plans | Level 2 | Fixed income commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | U.S. Plans | Level 2 | Real estate funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | U.S. Plans | Level 2 | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | U.S. Plans | Level 3 | Total |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | U.S. Plans | Level 3 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | U.S. Plans | Level 3 | Common and preferred stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | U.S. Plans | Level 3 | Equity commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | U.S. Plans | Level 3 | Government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | U.S. Plans | Level 3 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | U.S. Plans | Level 3 | Mortgage-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | U.S. Plans | Level 3 | Asset-backed securities and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | U.S. Plans | Level 3 | Fixed income commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | U.S. Plans | Level 3 | Real estate funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | U.S. Plans | Level 3 | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | Non-U.S. Plans | Total |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 403 | 429 |
Investment Assets at Fair Value | Non-U.S. Plans | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2 | 4 |
Investment Assets at Fair Value | Non-U.S. Plans | Common and preferred stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | Non-U.S. Plans | Equity commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 53 | 65 |
Investment Assets at Fair Value | Non-U.S. Plans | Government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 92 | 90 |
Investment Assets at Fair Value | Non-U.S. Plans | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 199 | 15 |
Investment Assets at Fair Value | Non-U.S. Plans | Mortgage-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | Non-U.S. Plans | Asset-backed securities and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | Non-U.S. Plans | Fixed income commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 49 | 131 |
Investment Assets at Fair Value | Non-U.S. Plans | Real estate funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 8 | 8 |
Investment Assets at Fair Value | Non-U.S. Plans | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 116 |
Investment Assets at Fair Value | Non-U.S. Plans | Level 1 | Total |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 130 | 121 |
Investment Assets at Fair Value | Non-U.S. Plans | Level 1 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2 | 4 |
Investment Assets at Fair Value | Non-U.S. Plans | Level 1 | Common and preferred stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | Non-U.S. Plans | Level 1 | Equity commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 13 | 6 |
Investment Assets at Fair Value | Non-U.S. Plans | Level 1 | Government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 24 | 22 |
Investment Assets at Fair Value | Non-U.S. Plans | Level 1 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 69 | 1 |
Investment Assets at Fair Value | Non-U.S. Plans | Level 1 | Mortgage-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | Non-U.S. Plans | Level 1 | Asset-backed securities and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | Non-U.S. Plans | Level 1 | Fixed income commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 20 | 67 |
Investment Assets at Fair Value | Non-U.S. Plans | Level 1 | Real estate funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2 | 0 |
Investment Assets at Fair Value | Non-U.S. Plans | Level 1 | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 21 |
Investment Assets at Fair Value | Non-U.S. Plans | Level 2 | Total |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 257 | 300 |
Investment Assets at Fair Value | Non-U.S. Plans | Level 2 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | Non-U.S. Plans | Level 2 | Common and preferred stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | Non-U.S. Plans | Level 2 | Equity commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 40 | 59 |
Investment Assets at Fair Value | Non-U.S. Plans | Level 2 | Government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 68 | 68 |
Investment Assets at Fair Value | Non-U.S. Plans | Level 2 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 120 | 14 |
Investment Assets at Fair Value | Non-U.S. Plans | Level 2 | Mortgage-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | Non-U.S. Plans | Level 2 | Asset-backed securities and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | Non-U.S. Plans | Level 2 | Fixed income commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 29 | 64 |
Investment Assets at Fair Value | Non-U.S. Plans | Level 2 | Real estate funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | Non-U.S. Plans | Level 2 | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 95 |
Investment Assets at Fair Value | Non-U.S. Plans | Level 3 | Total |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 16 | 8 |
Investment Assets at Fair Value | Non-U.S. Plans | Level 3 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | Non-U.S. Plans | Level 3 | Common and preferred stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | Non-U.S. Plans | Level 3 | Equity commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | Non-U.S. Plans | Level 3 | Government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | Non-U.S. Plans | Level 3 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 10 | 0 |
Investment Assets at Fair Value | Non-U.S. Plans | Level 3 | Mortgage-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | Non-U.S. Plans | Level 3 | Asset-backed securities and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | Non-U.S. Plans | Level 3 | Fixed income commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment Assets at Fair Value | Non-U.S. Plans | Level 3 | Real estate funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 6 | 8 |
Investment Assets at Fair Value | Non-U.S. Plans | Level 3 | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Assets held at NAV practical expedient (1) | U.S. Plans | Equity commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 131 | 165 |
Assets held at NAV practical expedient (1) | U.S. Plans | Fixed income commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 59 | 0 |
Assets held at NAV practical expedient (1) | U.S. Plans | Real estate funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 10 | 17 |
Assets held at NAV practical expedient (1) | U.S. Plans | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Assets held at NAV practical expedient (1) | Non-U.S. Plans | Equity commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 94 | 91 |
Assets held at NAV practical expedient (1) | Non-U.S. Plans | Fixed income commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 53 | 56 |
Assets held at NAV practical expedient (1) | Non-U.S. Plans | Real estate funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 13 | 16 |
Assets held at NAV practical expedient (1) | Non-U.S. Plans | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 60 | $ 15 |

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