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Related Party Balances and Transactions (Details) - California Foundation - Other accrued liabilities - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018
Related Party Transaction [Line Items] |  |
Pledge payable balance |  | $ 100
Pledge payable balance, after tax |  | $ 64
Pledge payment made to Foundation | $ 100 |
Pledge payment made to Foundation, net of tax | $ 64 |

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