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Related Party Balances and Transactions (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Investee |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenue from related parties |  | $ 154 | $ 112 | $ 112
Accounts receivable, related parties, current | $ 15 | 15 | $ 12 |
Selling, Distribution and Administrative Expenses | California Foundation |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Pre-tax charitable contribution expense | 100 |  |  |
After-tax charitable contribution expense | 64 |  |  |
Other accrued liabilities | California Foundation |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Pledge payable balance | $ 100 | $ 100 |  |

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