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Summary of Significant Accounting Policies Impact of New Lease Standard On Balance Sheet Line Items (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Other current assets | $ 4,578 | $ 4,533 | $ 4,581 |  |
Total current assets | 47,857 | 45,195 | 45,243 |  |
Property and equipment, net | 11,348 | 11,360 | 11,349 |  |
Operating lease right-of-use assets | 20,992 | 20,987 | 0 |  |
Intangible assets, net | 35,147 | 36,307 | 36,524 |  |
Other assets | 4,865 | 4,525 | 5,046 |  |
Total assets | 219,768 | 216,668 | 196,456 |  |
Accrued expenses | 10,443 | 10,659 | 10,711 |  |
Current portion of operating lease liabilities | 1,803 | 1,803 | 0 |  |
Current portion of long-term debt | 3,893 | 1,267 | 1,265 |  |
Total current liabilities | 50,631 | 45,762 | 44,009 |  |
Long-term operating lease liabilities | 18,961 | 18,832 | 0 |  |
Long-term debt | 67,888 | 71,348 | 71,444 |  |
Deferred income taxes | 7,540 | 7,740 | 7,677 |  |
Other long-term liabilities | 2,616 | 2,262 | 2,780 |  |
Total liabilities | 159,762 | 157,947 | 137,913 |  |
Retained earnings | 41,859 | 41,089 | 40,911 |  |
Total CVS health shareholders' equity | 59,686 | 58,403 | 58,225 |  |
Total shareholders' equity | $ 60,006 | 58,721 | $ 58,543 | $ (38,677) | $ (37,695)
Accounting Standards Update 2016-02 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Other current assets |  | (48) |  |  |
Total current assets |  | (48) |  |  |
Property and equipment, net |  | 11 |  |  |
Operating lease right-of-use assets |  | 20,987 |  |  |
Intangible assets, net |  | (217) |  |  |
Other assets |  | (521) |  |  |
Total assets |  | 20,212 |  |  |
Accrued expenses |  | (52) |  |  |
Current portion of operating lease liabilities |  | 1,803 |  |  |
Current portion of long-term debt |  | 2 |  |  |
Total current liabilities |  | 1,753 |  |  |
Long-term operating lease liabilities |  | 18,832 |  |  |
Long-term debt |  | (96) |  |  |
Deferred income taxes |  | 63 |  |  |
Other long-term liabilities |  | (518) |  |  |
Total liabilities |  | 20,034 |  |  |
Retained Earnings (Accumulated Deficit), Pre-Tax |  | 241 |  |  |
Total CVS health shareholders' equity |  | 178 |  |  |
Total shareholders' equity |  | $ 178 |  |  |

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