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Borrowing and Credit Agreements - Additional Information (Details) - USD ($) |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 4 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 15, 2017 | Dec. 03, 2017 | Jan. 03, 2017 | Jul. 27, 2016 | May 31, 2016 | May 16, 2016 | Jul. 20, 2015 | May 20, 2015 | Aug. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jun. 13, 2016 | Oct. 20, 2015 | Sep. 15, 2015
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  | $ 643,000,000 | $ 0 |  |  |
Carrying amount of long-term debt |  |  |  |  |  |  |  |  |  | $ 25,700,000,000 |  | $ 25,700,000,000 |  |  |  |  |
Omnicare, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes assumed |  |  |  |  |  |  |  |  | $ 3,100,000,000 |  |  |  |  |  |  |  |
Convertible debt |  |  |  |  |  |  |  |  |  |  | $ 5,000,000 |  |  | 5,000,000 |  |  |
Repayments of debt |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,400,000,000 |  |  |
Carrying amount of long-term debt |  |  |  |  |  |  |  |  | 700,000,000 |  |  |  |  |  |  |  |
Commercial Paper |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate |  |  |  |  |  |  |  |  |  | 2.00% |  | 2.00% | 1.22% |  |  |  |
Bridge Loan. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plan assets |  |  |  |  |  |  |  | $ 13,000,000,000 |  |  |  |  |  |  |  |  |
Loan processing fee |  |  |  |  |  |  |  | $ 52,000,000 |  |  |  |  |  |  |  |  |
Senior notes 1.900% due in 2018, 2.800% due in 2020, 3.500% due in 2022, 4.875% due in 2035, and 5.125% due in 2045 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 15,000,000,000 |  |  |  |  |  |  |  |  |  |
Term loan in connection with Aetna purchase | Aetna Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 5,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan In Connection With Aetna Purchase Tranche One [Member] | Aetna Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt term (in years) | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 3,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan In Connection With Aetna Purchase Tranche Two [Member] | Aetna Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt term (in years) | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 2,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Backup Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee percentage |  |  |  |  |  |  |  |  |  |  |  | 0.02% |  |  |  |  |
Long-term line of credit |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 0 | $ 0 |  |  |  |
Unsecured Backup Credit Facilities | Unsecured Backup Credit Facility Expiring May 17, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  | 1,000,000,000 |  | $ 1,000,000,000 |  |  |  |  |
Line of credit facility term (in years) |  |  |  |  |  |  |  |  |  |  |  | 364 days |  |  |  |  |
Unsecured Backup Credit Facilities | Unsecured Backup Credit Facility Expiring July 24, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  | 1,250,000,000 |  | $ 1,250,000,000 |  |  |  |  |
Line of credit facility term (in years) |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |
Unsecured Backup Credit Facilities | Unsecured Backup Credit Facility Expiring July 1, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  | 1,250,000,000 |  | $ 1,250,000,000 |  |  |  |  |
Line of credit facility term (in years) |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |
Unsecured Backup Credit Facilities | Unsecured Backup Credit Facility Expiring May 18, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  | 1,000,000,000 |  | $ 1,000,000,000 |  |  |  |  |
Line of credit facility term (in years) |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |
Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 2,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee percentage |  |  | 0.03% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of senior long-term debt |  |  |  |  |  |  | 14,800,000,000 |  |  |  |  |  |  |  |  |  |
Unsecured Debt | Unsecured Bridge Loan | Aetna Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance fees paid |  | $ 221,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of loan facility fees |  |  |  |  |  |  |  |  |  | $ 56,000,000 |  | $ 56,000,000 |  |  |  |  |
Debt instrument, face amount | $ 44,000,000,000 | $ 49,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt | 2.125% senior notes due 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 1,750,000,000 |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  | 2.125% |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt | 2.875% senior notes due 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 1,750,000,000 |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  | 2.875% |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt | 2016 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  | $ 3,500,000,000 |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt | 4.875% senior notes due 2035 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 2,000,000,000 |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  | 4.875% |  |  |  |  |  |  |  |  |  |
Unsecured Debt | 3.875% senior notes due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 3,000,000,000 |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  | 3.875% |  |  |  |  |  |  |  |  |  |
Unsecured Debt | 1.9% senior notes due 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 2,250,000,000 |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  | 1.90% |  |  |  |  |  |  |  |  |  |
Unsecured Debt | 2.8% senior notes due 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 2,750,000,000 |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  | 2.80% |  |  |  |  |  |  |  |  |  |
Unsecured Debt | 3.5% senior notes due 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  | 3.50% |  |  |  |  |  |  |  |  |  |
Unsecured Debt | 5.125% senior notes due 2045 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 3,500,000,000 |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  | 5.125% |  |  |  |  |  |  |  |  |  |
Senior Notes | 5.75% senior notes due 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  | 5.75% |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 6.6% senior notes due 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  | 6.60% |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 4.75% senior notes due 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  | 4.75% |  |  |  |  |  |  |  |  |  |  |
Senior Notes | Maximum Tender Offer Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized face amount to be repurchased |  |  |  |  | $ 2,250,000,000 | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |
Repurchased face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,250,000,000 |  |
Senior Notes | 6.25% senior notes due 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  | 6.25% |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 6.125% senior notes due 2039 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  | 6.125% |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 5.75% senior notes due 2041 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  | 5.75% |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 5% senior notes due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 296,000,000 |
Interest rate, stated percentage |  |  |  |  |  | 5.00% |  |  |  | 5.00% |  | 5.00% |  |  |  |  | 5.00%
Senior Notes | 5% senior notes due 2024 | Omnicare, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount of long-term debt |  |  |  |  |  |  |  |  | 300,000,000 |  |  |  |  |  |  |  |
Senior Notes | 4.750% senior notes due in 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 388,000,000 |
Interest rate, stated percentage |  |  |  |  |  | 4.75% |  |  |  | 4.75% |  | 4.75% |  |  |  |  | 4.75%
Senior Notes | 4.750% senior notes due in 2022 | Omnicare, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount of long-term debt |  |  |  |  |  |  |  |  | 400,000,000 |  |  |  |  |  |  |  |
Senior Notes | 4.875% senior notes due 2035 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  | 4.875% |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 3.875% senior notes due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  | 3.875% |  |  |  |  |  |  |  |  |  |  |
Senior Notes | Any and All Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchased face amount |  |  |  | $ 1,100,000,000 |  |  |  |  |  |  |  |  |  |  | $ 835,000,000 |  |
Redemption premium |  |  |  | 97,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Write off of deferred debt issuance cost |  |  |  | $ 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  | 101,000,000 |  |  |  |
Senior Notes | The Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption premium |  |  |  |  |  | $ 486,000,000 |  |  |  |  |  |  |  |  |  |  |
Write off of deferred debt issuance cost |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |
Payments of debt extinguishment costs |  |  |  |  |  | $ 6,000,000 |  |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  | $ 542,000,000 |  |  |  |
Convertible Debt. | Omnicare, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes assumed |  |  |  |  |  |  |  |  | $ 2,000,000,000 |  |  |  |  |  |  |  |
Loans Payable | Omnicare, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  |  |  |  |  | $ 400,000,000 |  |  |  |  |  |

X
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