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Significant Accounting Policies Narrative (Details) $ in Millions |  | 6 Months Ended |
--- | --- | --- | ---
Apr. 01, 2019 USD ($) | Sep. 30, 2019 USD ($) segment | Apr. 01, 2018 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Number of reportable segments | segment |  | 3 |
Present value of lease liabilities |  | $ 2,125 |
ROU assets |  | 2,002 |
Cumulative-effect adjustment to beginning retained earnings | $ 11 |  | $ 154
Impairment charge to ROU assets |  | $ 180 |
Retained Earnings |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative-effect adjustment to beginning retained earnings | 11 |  | $ 154
ASU 2016-02 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Present value of lease liabilities | 2,200 |  |
ROU assets | 2,100 |  |
Impairment charge to ROU assets | 89 |  |
ASU 2016-02 | Retained Earnings |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative-effect adjustment to beginning retained earnings | $ 69 |  |

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