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Pension Benefits - Summary Of Pension Plan Assets Using Fair Value Hierarchy By Asset Class (Details) - Pension Plans, Defined Benefit - USD ($) $ in Millions | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
--- | --- | --- | ---
United States |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 335 | $ 293 | $ 262
United States | Investment Assets at Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 217 | 93 |
United States | Investment Assets at Fair Value | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 39 | 8 |
United States | Investment Assets at Fair Value | Common and preferred stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 7 | 17 |
United States | Investment Assets at Fair Value | Equity commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
United States | Investment Assets at Fair Value | Government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 85 | 27 |
United States | Investment Assets at Fair Value | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 58 | 12 |
United States | Investment Assets at Fair Value | Mortgage-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 7 | 10 |
United States | Investment Assets at Fair Value | Asset-backed securities and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 21 | 19 |
United States | Investment Assets at Fair Value | Fixed income commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
United States | Investment Assets at Fair Value | Real estate funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
United States | Investment Assets at Fair Value | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 |  |
United States | Investment Assets at Fair Value | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 46 | 25 |
United States | Investment Assets at Fair Value | Level 1 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 39 | 8 |
United States | Investment Assets at Fair Value | Level 1 | Common and preferred stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 7 | 17 |
United States | Investment Assets at Fair Value | Level 1 | Equity commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
United States | Investment Assets at Fair Value | Level 1 | Government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
United States | Investment Assets at Fair Value | Level 1 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
United States | Investment Assets at Fair Value | Level 1 | Mortgage-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
United States | Investment Assets at Fair Value | Level 1 | Asset-backed securities and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
United States | Investment Assets at Fair Value | Level 1 | Fixed income commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
United States | Investment Assets at Fair Value | Level 1 | Real estate funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
United States | Investment Assets at Fair Value | Level 1 | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 |  |
United States | Investment Assets at Fair Value | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 171 | 68 |
United States | Investment Assets at Fair Value | Level 2 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
United States | Investment Assets at Fair Value | Level 2 | Common and preferred stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
United States | Investment Assets at Fair Value | Level 2 | Equity commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
United States | Investment Assets at Fair Value | Level 2 | Government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 85 | 27 |
United States | Investment Assets at Fair Value | Level 2 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 58 | 12 |
United States | Investment Assets at Fair Value | Level 2 | Mortgage-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 7 | 10 |
United States | Investment Assets at Fair Value | Level 2 | Asset-backed securities and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 21 | 19 |
United States | Investment Assets at Fair Value | Level 2 | Fixed income commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
United States | Investment Assets at Fair Value | Level 2 | Real estate funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
United States | Investment Assets at Fair Value | Level 2 | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 |  |
United States | Investment Assets at Fair Value | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
United States | Investment Assets at Fair Value | Level 3 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
United States | Investment Assets at Fair Value | Level 3 | Common and preferred stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
United States | Investment Assets at Fair Value | Level 3 | Equity commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
United States | Investment Assets at Fair Value | Level 3 | Government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
United States | Investment Assets at Fair Value | Level 3 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
United States | Investment Assets at Fair Value | Level 3 | Mortgage-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
United States | Investment Assets at Fair Value | Level 3 | Asset-backed securities and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
United States | Investment Assets at Fair Value | Level 3 | Fixed income commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
United States | Investment Assets at Fair Value | Level 3 | Real estate funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
United States | Investment Assets at Fair Value | Level 3 | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 |  |
United States | Assets held at NAV practical expedient (1) | Equity commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 54 | 131 |
United States | Assets held at NAV practical expedient (1) | Fixed income commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 53 | 59 |
United States | Assets held at NAV practical expedient (1) | Real estate funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 11 | 10 |
United States | Assets held at NAV practical expedient (1) | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 687 | 623 | $ 607
Non-U.S. Plans | Investment Assets at Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 598 | 403 |
Non-U.S. Plans | Investment Assets at Fair Value | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 3 | 2 |
Non-U.S. Plans | Investment Assets at Fair Value | Common and preferred stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Investment Assets at Fair Value | Equity commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 135 | 53 |
Non-U.S. Plans | Investment Assets at Fair Value | Government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 118 | 92 |
Non-U.S. Plans | Investment Assets at Fair Value | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 250 | 199 |
Non-U.S. Plans | Investment Assets at Fair Value | Mortgage-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Investment Assets at Fair Value | Asset-backed securities and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Investment Assets at Fair Value | Fixed income commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 64 | 49 |
Non-U.S. Plans | Investment Assets at Fair Value | Real estate funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2 | 8 |
Non-U.S. Plans | Investment Assets at Fair Value | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 26 |  |
Non-U.S. Plans | Investment Assets at Fair Value | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 187 | 130 |
Non-U.S. Plans | Investment Assets at Fair Value | Level 1 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 3 | 2 |
Non-U.S. Plans | Investment Assets at Fair Value | Level 1 | Common and preferred stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Investment Assets at Fair Value | Level 1 | Equity commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 41 | 13 |
Non-U.S. Plans | Investment Assets at Fair Value | Level 1 | Government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 5 | 24 |
Non-U.S. Plans | Investment Assets at Fair Value | Level 1 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 114 | 69 |
Non-U.S. Plans | Investment Assets at Fair Value | Level 1 | Mortgage-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Investment Assets at Fair Value | Level 1 | Asset-backed securities and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Investment Assets at Fair Value | Level 1 | Fixed income commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 20 |
Non-U.S. Plans | Investment Assets at Fair Value | Level 1 | Real estate funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2 | 2 |
Non-U.S. Plans | Investment Assets at Fair Value | Level 1 | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 22 |  |
Non-U.S. Plans | Investment Assets at Fair Value | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 407 | 257 |
Non-U.S. Plans | Investment Assets at Fair Value | Level 2 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Investment Assets at Fair Value | Level 2 | Common and preferred stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Investment Assets at Fair Value | Level 2 | Equity commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 94 | 40 |
Non-U.S. Plans | Investment Assets at Fair Value | Level 2 | Government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 113 | 68 |
Non-U.S. Plans | Investment Assets at Fair Value | Level 2 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 136 | 120 |
Non-U.S. Plans | Investment Assets at Fair Value | Level 2 | Mortgage-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Investment Assets at Fair Value | Level 2 | Asset-backed securities and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Investment Assets at Fair Value | Level 2 | Fixed income commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 64 | 29 |
Non-U.S. Plans | Investment Assets at Fair Value | Level 2 | Real estate funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Investment Assets at Fair Value | Level 2 | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 |  |
Non-U.S. Plans | Investment Assets at Fair Value | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 4 | 16 |
Non-U.S. Plans | Investment Assets at Fair Value | Level 3 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Investment Assets at Fair Value | Level 3 | Common and preferred stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Investment Assets at Fair Value | Level 3 | Equity commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Investment Assets at Fair Value | Level 3 | Government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Investment Assets at Fair Value | Level 3 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 10 |
Non-U.S. Plans | Investment Assets at Fair Value | Level 3 | Mortgage-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Investment Assets at Fair Value | Level 3 | Asset-backed securities and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Investment Assets at Fair Value | Level 3 | Fixed income commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Investment Assets at Fair Value | Level 3 | Real estate funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 6 |
Non-U.S. Plans | Investment Assets at Fair Value | Level 3 | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 4 |  |
Non-U.S. Plans | Assets held at NAV practical expedient (1) | Equity commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 27 | 94 |
Non-U.S. Plans | Assets held at NAV practical expedient (1) | Fixed income commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 53 |
Non-U.S. Plans | Assets held at NAV practical expedient (1) | Real estate funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 13 |
Non-U.S. Plans | Assets held at NAV practical expedient (1) | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 62 | $ 60 |

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