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Acquisitions - Omnicare Acquisition (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 4 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 18, 2015 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Aug. 31, 2015
Fair Values of Assets Acquired and Liabilities Assumed: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 38,451 |  |  |  | $ 38,249 |  |  |  | $ 38,106 | $ 38,451 | $ 38,249 | $ 38,106 |
Goodwill |  |  |  |  |  |  |  |  |  |  | 385 | 126 |  |
Net revenues |  | 48,385 | $ 46,181 | $ 45,685 | $ 44,514 | 45,971 | $ 44,615 | $ 43,725 | $ 43,215 |  | 184,765 | 177,526 | 153,290 |
Net income |  |  |  |  |  |  |  |  |  |  | 6,623 | 5,319 | 5,239 |
Retail/LTC Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Values of Assets Acquired and Liabilities Assumed: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | 16,632 |  |  |  | 16,612 |  |  |  | 16,421 | 16,632 | 16,612 | 16,421 |
Goodwill |  |  |  |  |  |  |  |  |  |  | 203 | 126 |  |
Pharmacy Services Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Values of Assets Acquired and Liabilities Assumed: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 21,819 |  |  |  | $ 21,637 |  |  |  | 21,685 | 21,819 | $ 21,637 | 21,685 |
Goodwill |  |  |  |  |  |  |  |  |  |  | $ 182 |  |  |
Omnicare, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  | 73.00%
Business acquisition, share price (in dollars per share) | $ 98 |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred | $ 9,600 |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred, liabilities incurred | 3,100 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Values of Assets Acquired and Liabilities Assumed: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets (including cash of $298) | 1,657 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | 298 |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment | 313 |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 9,139 |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets | 3,962 |  |  |  |  |  |  |  |  |  |  |  |  |
Other noncurrent assets | 63 |  |  |  |  |  |  |  |  |  |  |  |  |
Current liabilities | (773) |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt | (3,110) |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income tax liabilities | (1,498) |  |  |  |  |  |  |  |  |  |  |  |  |
Other noncurrent liabilities | (69) |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interest | (39) |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration | 9,645 |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, expected tax deductible | $ 400 |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average useful life (in years) | 18 years 9 months 18 days |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition related costs |  |  |  |  |  |  |  |  |  |  |  |  | 70 |
Net revenues |  |  |  |  |  |  |  |  |  | 2,600 |  |  |  |
Net income |  |  |  |  |  |  |  |  |  | $ 61 |  |  |  |
Business Acquisition, Pro Forma Information: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  | 156,798 |
Income from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,277 |
Basic earnings per share from continuing operations (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.70 |
Diluted earnings per share from continuing operations (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.66 |
Restructuring costs |  |  |  |  |  |  |  |  |  |  |  |  | $ 135 |
Omnicare, Inc. | Retail/LTC Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Values of Assets Acquired and Liabilities Assumed: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 8,700 |  |  |  |  |  |  |  |  |  |  |  |  |
Omnicare, Inc. | Pharmacy Services Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Values of Assets Acquired and Liabilities Assumed: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 400 |  |  |  |  |  |  |  |  |  |  |  |  |
Omnicare, Inc. | Customer Relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Values of Assets Acquired and Liabilities Assumed: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets | $ 3,900 |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average useful life (in years) | 19 years 1 month 6 days |  |  |  |  |  |  |  |  |  |  |  |  |
Omnicare, Inc. | Trade Names |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Values of Assets Acquired and Liabilities Assumed: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets | $ 74 |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average useful life (in years) | 2 years 10 months 24 days |  |  |  |  |  |  |  |  |  |  |  |  |

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