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Noncontrolling Interests and Redeemable Noncontrolling Interests - Narrative (Details) shares in Millions | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2014 USD ($) | Apr. 30, 2014 USD ($) shares | Dec. 31, 2015 | Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) € / shares | Dec. 02, 2014 € / shares
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Put right value, exercise period |  |  | 2 months | 2 months |  |  |
Noncontrolling Interest |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Decrease in noncontrolling interest |  |  |  |  | $ 60,000,000 |  |
Celesio |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Annual recurring compensation (in euro per share) | € / shares |  |  |  |  |  |  | € 0.83
Dividends paid (in euro per share) | € / shares |  |  |  |  |  | € 0.83 |
Put right (in dollars per share) | € / shares |  |  |  |  |  |  | € 22.99
Percentage points |  |  |  |  |  |  | 5.00%
Total attribution of net income to the noncontrolling shareholders |  |  |  | $ 44,000,000 | 62,000,000 |  |
Carrying value of noncontrolling interests |  |  |  | 1,410,000,000 | 1,390,000,000 | € 1,500,000,000 |
Maximum redemption value |  |  |  | $ 1,280,000,000.00 | $ 1,210,000,000.00 |  |
Percentage of outstanding common shares |  |  |  | 76.00% | 76.00% |  |
Celesio | Redeemable Noncontrolling Interests |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Guaranteed dividend amount |  |  |  |  | $ 50,000,000 |  |
Recurring compensation |  |  |  | $ 44,000,000 | 12,000,000 |  |
Decrease in noncontrolling interest |  |  |  |  | 9,000,000 |  |
Celesio | Noncontrolling Interest |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Decrease in noncontrolling interest | $ 25,000,000 | $ 35,000,000 |  |  |  |  |
Additional purchase of shares | shares |  | 1 |  |  |  |  |
Net foreign currency translation losses attributable to noncontrolling interest |  |  |  |  | $ 138,000,000 |  |

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