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Revenues - Customer Concentration, Product Sales (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) customer	Dec. 31, 2019 USD ($) customer	Dec. 31, 2018 USD ($) customer
Revenue, Major Customer [Line Items]
Product sales									$ 25,424	$ 23,362	$ 23,747
Number of major customers (as defined) accounting for more than 10% of total revenue | customer									3	3	3
Major customers (as defined) accounting for more than 10% of gross trade receivables | customer									3	3
Product [Member]
Revenue, Major Customer [Line Items]
Product sales	$ 6,334	$ 6,104	$ 5,908	$ 5,894	$ 5,881	$ 5,463	$ 5,574	$ 5,286	$ 24,240	$ 22,204	$ 22,533
Product [Member] | AmerisourceBergen Corporation [Member]
Revenue, Major Customer [Line Items]
Product sales									$ 14,743	$ 12,301	$ 12,091
Gross product sales to major customer (as defined) as a percentage of total gross revenues									34.00%	33.00%	33.00%
Product [Member] | McKesson Corporation [Member]
Revenue, Major Customer [Line Items]
Product sales									$ 13,779	$ 11,795	$ 11,434
Gross product sales to major customer (as defined) as a percentage of total gross revenues									32.00%	31.00%	31.00%
Product [Member] | Cardinal Health, Inc. [Member]
Revenue, Major Customer [Line Items]
Product sales									$ 7,332	$ 6,538	$ 7,475
Gross product sales to major customer (as defined) as a percentage of total gross revenues									17.00%	17.00%	20.00%

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