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Business Combinations (Details) € in Millions, £ in Millions, $ in Millions, CAD in Billions |  |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 28, 2016 USD ($) pharmacy | Dec. 28, 2016 CAD | Aug. 31, 2016 GBP (£) | Aug. 31, 2016 USD ($) | Apr. 01, 2016 EUR (€) cancer_treatment_facility state | Apr. 01, 2016 USD ($) cancer_treatment_facility state | Feb. 29, 2016 GBP (£) | Feb. 29, 2016 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Mar. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net purchase consideration |  |  |  |  |  |  |  |  |  | $ 4,174 | $ 25 |
Goodwill |  |  |  |  |  |  |  |  | $ 10,612 | 10,612 |  | $ 9,786
Held-for-sale |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Current assets held for sale |  |  |  |  |  |  |  |  | 110 | 110 |  | 635
Current liabilities held for sale |  |  |  |  |  |  |  |  | 1 | 1 |  | $ 660
Rexall Health |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net purchase consideration | $ 2,121 |  |  |  |  |  |  |  |  |  |  |
Goodwill | 1,142 |  |  |  |  |  |  |  |  |  |  |
Intangible assets | 656 |  |  |  |  |  |  |  |  |  |  |
Rexall Health | CANADA |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net purchase consideration | $ 2,100 | CAD 2.9 |  |  |  |  |  |  |  |  |  |
Number of cancer treatment facilities acquired | pharmacy | 470 |  |  |  |  |  |  |  |  |  |  |
Total assets acquired, excluding goodwill and intangibles | $ 687 |  |  |  |  |  |  |  |  |  |  |
Total liabilities acquired, excluding goodwill and intangibles | 199 |  |  |  |  |  |  |  |  |  |  |
Goodwill | 1,100 |  |  |  |  |  |  |  |  |  |  |
Goodwill expected to be tax deductible | 860 |  |  |  |  |  |  |  |  |  |  |
Intangible assets | $ 656 |  |  |  |  |  |  |  |  |  |  |
Vantage |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net purchase consideration |  |  |  |  |  | $ 515 |  |  |  |  |  |
Number of cancer treatment facilities acquired | cancer_treatment_facility |  |  |  |  | 51 | 51 |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | 516 | 516 |  |
Intangible assets |  |  |  |  |  |  |  |  | 15 | 15 |  |
Number of states | state |  |  |  |  | 13 | 13 |  |  |  |  |  |
Fair value of noncontrolling interests |  |  |  |  |  |  |  |  | 93 | 93 |  |
Vantage | Noncompete Agreements |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  | 7 | $ 7 |  |
Estimated weighted average life of the acquired intangibles |  |  |  |  |  |  |  |  |  | 4 years |  |
Biologics |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net purchase consideration |  |  |  |  |  | $ 692 |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | 572 | $ 572 |  |
Intangible assets |  |  |  |  |  |  |  |  | 193 | 193 |  |
Biologics | Trade names |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  | 170 | $ 170 |  |
Estimated weighted average life of the acquired intangibles |  |  |  |  |  |  |  |  |  | 9 years |  |
Vantage and Biologics |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | 1,088 | $ 1,088 |  |
Intangible assets |  |  |  |  |  |  |  |  | 208 | 208 |  |
Fair value of noncontrolling interests |  |  |  |  |  |  |  |  | 93 | 93 |  |
UDG |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net purchase consideration |  |  |  |  | € 380 | $ 431 |  |  |  |  |  |
Total assets acquired, excluding goodwill and intangibles |  |  |  |  |  |  |  |  | 467 | 467 |  |
Total liabilities acquired, excluding goodwill and intangibles |  |  |  |  |  |  |  |  | 332 | 332 |  |
Increase in goodwill recognized |  |  |  |  |  |  |  |  | 16 |  |  |
UDG | Customer scripts |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  | $ 115 | $ 115 |  |
Estimated weighted average life of the acquired intangibles |  |  |  |  |  |  |  |  |  | 10 years |  |
Sainsbury | U.K. |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total assets acquired, excluding goodwill and intangibles |  |  |  | $ 29 |  |  |  |  |  |  |  |
Total liabilities acquired, excluding goodwill and intangibles |  |  |  | 18 |  |  |  |  |  |  |  |
Goodwill |  |  |  | 92 |  |  |  |  |  |  |  |
Gross purchase consideration paid |  |  | £ 128 | 168 |  |  |  |  |  |  |  |
Cash payment made as part of purchase consideration |  |  |  |  |  |  | £ 125 | $ 174 |  |  |  |
Interest rate (percent) |  |  |  |  |  |  | 0.033 | 0.033 |  |  |  |
Sainsbury | U.K. | Pharmacy licenses |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  | $ 65 |  |  |  |  |  |  |  |
Estimated weighted average life of the acquired intangibles |  |  | 15 years | 15 years |  |  |  |  |  |  |  |

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