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Debt and Financing Activities - Senior Bridge Term Loan Facilities (Details) - 2014 Bridge Loan - USD ($) |  |  | 1 Months Ended | 2 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 10, 2014 | Feb. 04, 2014 | Jan. 31, 2014 | Mar. 11, 2014 | Mar. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |
Credit facility borrowing capacity |  |  | $ 5,500,000,000.0 |  |
Credit facility expiration period |  |  | 364 days |  |
Amount borrowed under facility |  | $ 4,957,000,000 |  |  |
Repayments of lines of credit | $ 4,076,000,000 |  |  |  |
Fees related to bridge loan |  |  |  |  | $ 46,000,000
London Interbank Offered Rate (LIBOR) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit facility interest rate |  |  |  | 1.39% |

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