Borrowings	6 Months Ended
Jun. 30, 2015
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	Borrowings On May 20, 2015, in connection with the proposed acquisition of Omnicare, the Company entered into a $13 billion unsecured bridge loan facility. The Company paid approximately $52 million in fees upon entering into the agreement. The fees were capitalized in other current assets and amortized as interest expense over the period the bridge facility was outstanding. The bridge loan facility expired on July 20, 2015 upon the Company’s issuance of unsecured senior notes totaling a net $14.8 billion in proceeds as discussed below. The Company recorded $36 million of amortization of the bridge loan facility fees during the three and six months ended June 30, 2015. On July 20, 2015, the Company issued an aggregate of $2.25 billion of 1.9% unsecured senior notes due 2018 (“2018 Notes”), an aggregate of $2.75 billion of 2.8% unsecured senior notes due 2020 (“2020 Notes”), an aggregate of $1.50 billion of 3.5% unsecured senior notes due 2022 (“2022 Notes”), an aggregate of $3.00 billion of 3.875% unsecured senior notes due 2025 (“2025 Notes”), an aggregate of $2.00 billion of 4.875% unsecured senior notes due 2035 (“2035 Notes”), and an aggregate of $3.50 billion of 5.125% unsecured senior notes due 2045 (“2045 Notes” and, together with the 2018 Notes, 2020 Notes, 2022 Notes, 2025 Notes and 2035 Notes, the “Notes”) for total proceeds of approximately $14.8 billion, net of discounts and underwriting fees. The Notes pay interest semi-annually and contain redemption terms which allow or require the Company to redeem the Notes at a defined redemption price plus accrued and unpaid interest at the redemption date. The 2018 Notes, 2020 Notes, 2022 Notes, 2035 Notes and 2045 Notes contain a special mandatory redemption clause which will require the Company to redeem such notes at a price equal to 101% of their principal amount plus accrued interest in the event the Omnicare Acquisition is not completed on or prior to May 20, 2016, which date will be extended automatically to August 20, 2016 if regulatory approval is the only closing condition under the Merger Agreement on May 20, 2016 that has not been fulfilled and all other closing conditions either have been fulfilled or are then capable of being fulfilled, or in the event that, on or prior to such date, the Merger Agreement is terminated other than as a result of consummating the Omnicare Acquisition. The 2025 Notes are not subject to the special mandatory redemption, and a termination of the Target Pharmacy Acquisition will not trigger the special mandatory redemption. The net proceeds of the Notes are to be used to fund the Omnicare Acquisition and the Target Pharmacy Acquisition. Any remaining proceeds will be used for general corporate purposes.

Borrowings

On May 20, 2015, in connection with the proposed acquisition of Omnicare, the Company entered into a $13 billion unsecured bridge loan facility. The Company paid approximately $52 million in fees upon entering into the agreement. The fees were capitalized in other current assets and amortized as interest expense over the period the bridge facility was outstanding. The bridge loan facility expired on July 20, 2015 upon the Company’s issuance of unsecured senior notes totaling a net $14.8 billion in proceeds as discussed below. The Company recorded $36 million of amortization of the bridge loan facility fees during the three and six months ended June 30, 2015.

On July 20, 2015, the Company issued an aggregate of $2.25 billion of 1.9% unsecured senior notes due 2018 (“2018 Notes”), an aggregate of $2.75 billion of 2.8% unsecured senior notes due 2020 (“2020 Notes”), an aggregate of $1.50 billion of 3.5% unsecured senior notes due 2022 (“2022 Notes”), an aggregate of $3.00 billion of 3.875% unsecured senior notes due 2025 (“2025 Notes”), an aggregate of $2.00 billion of 4.875% unsecured senior notes due 2035 (“2035 Notes”), and an aggregate of $3.50 billion of 5.125% unsecured senior notes due 2045 (“2045 Notes” and, together with the 2018 Notes, 2020 Notes, 2022 Notes, 2025 Notes and 2035 Notes, the “Notes”) for total proceeds of approximately $14.8 billion, net of discounts and underwriting fees. The Notes pay interest semi-annually and contain redemption terms which allow or require the Company to redeem the Notes at a defined redemption price plus accrued and unpaid interest at the redemption date. The 2018 Notes, 2020 Notes, 2022 Notes, 2035 Notes and 2045 Notes contain a special mandatory redemption clause which will require the Company to redeem such notes at a price equal to 101% of their principal amount plus accrued interest in the event the Omnicare Acquisition is not completed on or prior to May 20, 2016, which date will be extended automatically to August 20, 2016 if regulatory approval is the only closing condition under the Merger Agreement on May 20, 2016 that has not been fulfilled and all other closing conditions either have been fulfilled or are then capable of being fulfilled, or in the event that, on or prior to such date, the Merger Agreement is terminated other than as a result of consummating the Omnicare Acquisition. The 2025 Notes are not subject to the special mandatory redemption, and a termination of the Target Pharmacy Acquisition will not trigger the special mandatory redemption. The net proceeds of the Notes are to be used to fund the Omnicare Acquisition and the Target Pharmacy Acquisition. Any remaining proceeds will be used for general corporate purposes.