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Healthcare Technology Net Asset Exchange (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Gain from sale of business, pre-tax | $ 0 |  | $ 109,000,000 |  |  |  | $ 0 | $ 109,000,000 |
Net income (loss) from Change Healthcare | (50,000,000) |  | (90,000,000) |  |  |  | (162,000,000) | (271,000,000) |
Carrying value of investment | 3,566,000,000 |  |  |  |  |  | 3,566,000,000 |  | $ 3,728,000,000
Change Healthcare, LLC (“Change Healthcare”) | Tax Receivable Agreement (“TRA”) |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Noncurrent liability | 0 |  |  |  |  |  | 0 |  | 90,000,000
Other | Change Healthcare, LLC (“Change Healthcare”) | Tax Receivable Agreement (“TRA”) |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Gain on derecognition of liability, pre-tax |  | $ 90,000,000 |  |  |  |  |  |  |
Gain on derecognition of liability, after tax |  | $ 66,000,000 |  |  |  |  |  |  |
Operating Segments | Other |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Gain on derecognition of liability, pre-tax |  |  | (46,000,000) |  |  |  |  | (46,000,000) |
Gain on derecognition of liability, after tax |  |  | (30,000,000) |  |  |  |  | (30,000,000) |
Joint Venture | Transition Services Agreements (“TSA”) |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Fees incurred or earned from TSA and Advisory agreements | $ 12,000,000 |  | 22,000,000 |  |  |  | $ 48,000,000 | 69,000,000 |
Joint Venture | Core MTS Businesses |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Ownership interest in the joint venture (percent) | 70.00% |  |  |  |  |  | 70.00% |  |
Change Healthcare, LLC (“Change Healthcare”) | Core MTS Businesses | Operating Segments | Other |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Gain from sale of business, pre-tax |  |  |  |  | $ 37,000,000 | $ 3,900,000,000 |  |  |
Gain from sale of business, after tax |  |  |  |  | $ 22,000,000 | $ 3,000,000,000 |  |  |
Proceeds from Divestiture of Businesses |  |  |  | $ 126,000,000 |  |  |  |  |
Change Healthcare, LLC (“Change Healthcare”) | Joint Venture |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Ownership interest in the joint venture (percent) |  |  |  |  |  | 70.00% |  |  |
Net income (loss) from Change Healthcare | $ (50,000,000) |  | $ (90,000,000) |  |  |  | $ (162,000,000) | $ (271,000,000) |
Carrying value of investment | 3,566,000,000 |  |  |  |  |  | 3,566,000,000 |  | 3,728,000,000
Excess of carrying value of investment over proportional share of book value | $ 4,226,000,000 |  |  |  |  |  | 4,226,000,000 |  | $ 4,472,000,000
Gain on derecognition of liability, pre-tax |  |  |  |  |  |  | 90,000,000 |  |
Gain on derecognition of liability, after tax |  |  |  |  |  |  | $ 66,000,000 |  |

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