Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Cash receipts from customers	$ 58,873.0	$ 43,369.0
Cash paid for inventory and prescriptions dispensed by retail network pharmacies	(35,645.0)	(35,102.0)
Insurance benefits paid	(12,951.0)	(1,093.0)
Cash paid to other suppliers and employees	(7,403.0)	(4,271.0)
Interest and investment income received	250.0	50.0
Interest Paid	(1,123.0)	(545.0)
Income taxes paid	(53.0)	(53.0)
Net cash provided by operating activities	1,948.0	2,355.0
Cash flows from investing activities:
Proceeds from sales and maturities of investments	1,986.0	10.0
Purchase of investments	(2,047.0)	(33.0)
Purchases of property and equipment	(716.0)	(482.0)
Acquisitions (net of cash acquired)	(124.0)	(353.0)
Proceeds from sale of subsidiary	0.0	725.0
Other	10.0	2.0
Net cash used in investing activities	(891.0)	(131.0)
Cash flows from financing activities:
Net borrowings (repayments) of short-term debt	2,285.0	(1,276.0)
Proceeds from issuance of long-term debt	0.0	39,376.0
Repayments of long-term debt	(882.0)	(1.0)
Derivative settlements	0.0	446.0
Dividends paid	(649.0)	(508.0)
Proceeds from exercise of stock options	101.0	107.0
Payments for taxes related to net share settlement of equity awards	(44.0)	(4.0)
Other	5.0	0.0
Net cash provided by financing activities	816.0	38,140.0
Cash and cash equivalents at the beginning of the period	4,295.0	1,900.0
Cash and cash equivalents at the end of the period	6,168.0	42,264.0
Reconciliation of net income to net cash provided by operating activities:
Net income	1,427.0	998.0
Adjustments required to reconcile net income to net cash provided by operating activities: [Abstract]
Depreciation and amortization	1,111.0	644.0
Stock-based compensation	114.0	55.0
Deferred income taxes and other noncash items	153.0	62.0
Change in operating assets and liabilities, net of effects from acquisitions: [Abstract]
Accounts receivable, net	(1,989.0)	(857.0)
Inventories	1,001.0	464.0
Other assets	(389.0)	(57.0)
Accounts payable and pharmacy claims and discounts payable	(22.0)	(178.0)
Health care costs payable and other insurance liabilities	553.0	236.0
Other liabilities	(11.0)	988.0
Net cash provided by operating activities	1,948.0	2,355.0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease)	$ 1,873.0	$ 40,364.0

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The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.

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No definition available.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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