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Significant Accounting Policies - Redeemable Noncontrolling Interest and Revenue Recognition (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) item | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Aug. 31, 2015 | Aug. 18, 2015
Redeemable Noncontrolling Interest |  |  |  |  |
Number of components | item | 2 |  |  |  |
Redeemable Noncontrolling Interest Rollforward |  |  |  |  |
Beginning balance | $ 4 |  |  |  |
Ending balance | $ 4 | $ 4 |  |  |
Omnicare, Inc. |  |  |  |  |
Redeemable Noncontrolling Interest |  |  |  |  |
Percentage of voting interests acquired |  |  |  | 73.00% | 100.00%
Redeemable Noncontrolling Interest Rollforward |  |  |  |  |
Beginning balance |  | 39 |  |  |
Acquisition of noncontrolling interest |  |  | $ 39 |  |
Net income attributable to noncontrolling interest |  | 1 | 1 |  |
Distributions |  | (2) | (1) |  |
Purchase of noncontrolling interest |  | (39) |  |  |
Reclassification to capital surplus in connection with purchase of noncontrolling interest |  | $ 1 |  |  |
Ending balance |  |  | $ 39 |  |

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(22)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(24)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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