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Goodwill and Intangible Assets, Net - Narrative - Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Mar. 31, 2018
Goodwill [Line Items] |  |  |  |  |  |
Goodwill and asset impairment charges | $ 0 | $ 570 | $ 350 | $ 570 | $ 350 |
Amortization expense of intangible assets | 121 |  | $ 126 | 243 | $ 247 |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |  |  |
Estimated annual amortization expense, remainder of 2019 | 228 |  |  | 228 |  |
Estimated annual amortization expense, 2020 | 443 |  |  | 443 |  |
Estimated annual amortization expense, 2021 | 420 |  |  | 420 |  |
Estimated annual amortization expense, 2022 | 405 |  |  | 405 |  |
Estimated annual amortization expense, 2023 | 339 |  |  | 339 |  |
Estimated annual amortization expense, thereafter | 2,293 |  |  | 2,293 |  |
European Pharmaceutical Solutions |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Accumulated goodwill impairment losses | 1,776 |  |  | 1,776 |  | $ 1,299
Goodwill and asset impairment charges |  | $ 570 |  | 570 |  |
Other |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Accumulated goodwill impairment losses | $ 456 |  |  | 456 |  | $ 456
Goodwill and asset impairment charges |  |  |  | $ 0 |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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