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Financial Instruments - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Assets
Investments, debt securities	$ 89	$ 1,785
Publicly traded equity securities	1,787	838
Derivative assets	182	288
Liabilities
Contingent consideration	841	767	$ 788
Derivative liabilities	525	97
Corporate notes and bonds
Assets
Investments, debt securities	0	621
Asset-backed securities
Assets
Investments, debt securities	0	227
U.S. government and agency securities
Assets
Investments, debt securities	84	269
Foreign government bonds
Assets
Investments, debt securities	5	0
Fair Value, Measurements, Recurring
Assets
Investments	785	2,243
Other assets	1,091	380
Derivative assets	182	288
Total assets	2,058	2,911
Liabilities
Contingent consideration	841	767
Derivative liabilities	525	97
Total liabilities	1,366	864
Fair Value, Measurements, Recurring | Interest rate swap contracts
Assets
Derivative assets	55	15
Liabilities
Derivative liabilities	0	1
Fair Value, Measurements, Recurring | Foreign exchange contracts
Assets
Derivative assets	90	169
Liabilities
Derivative liabilities	505	95
Fair Value, Measurements, Recurring | Purchased currency options
Assets
Derivative assets	37	104
Liabilities
Derivative liabilities	20	1
Fair Value, Measurements, Recurring | Commercial paper
Assets
Investments, debt securities	0	668
Fair Value, Measurements, Recurring | Corporate notes and bonds
Assets
Investments, debt securities	0	621
Fair Value, Measurements, Recurring | Asset-backed securities
Assets
Investments, debt securities	0	227
Fair Value, Measurements, Recurring | U.S. government and agency securities
Assets
Investments, debt securities	0	209
Other assets	84	60
Fair Value, Measurements, Recurring | Foreign government bonds
Assets
Investments, debt securities	5	0
Fair Value, Measurements, Recurring | Publicly traded equity securities
Assets
Publicly traded equity securities	780	518
Other assets	1,007	320
Fair Value, Measurements, Recurring | Level 1
Assets
Investments	780	518
Other assets	1,091	380
Derivative assets	0	0
Total assets	1,871	898
Liabilities
Contingent consideration	0	0
Derivative liabilities	0	0
Total liabilities	0	0
Fair Value, Measurements, Recurring | Level 1 | Interest rate swap contracts
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Level 1 | Foreign exchange contracts
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Level 1 | Purchased currency options
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Level 1 | Commercial paper
Assets
Investments, debt securities	0	0
Fair Value, Measurements, Recurring | Level 1 | Corporate notes and bonds
Assets
Investments, debt securities	0	0
Fair Value, Measurements, Recurring | Level 1 | Asset-backed securities
Assets
Investments, debt securities	0	0
Fair Value, Measurements, Recurring | Level 1 | U.S. government and agency securities
Assets
Investments, debt securities	0	0
Other assets	84	60
Fair Value, Measurements, Recurring | Level 1 | Foreign government bonds
Assets
Investments, debt securities	0	0
Fair Value, Measurements, Recurring | Level 1 | Publicly traded equity securities
Assets
Publicly traded equity securities	780	518
Other assets	1,007	320
Fair Value, Measurements, Recurring | Level 2
Assets
Investments	5	1,725
Other assets	0	0
Derivative assets	182	288
Total assets	187	2,013
Liabilities
Contingent consideration	0	0
Derivative liabilities	525	97
Total liabilities	525	97
Fair Value, Measurements, Recurring | Level 2 | Interest rate swap contracts
Assets
Derivative assets	55	15
Liabilities
Derivative liabilities	0	1
Fair Value, Measurements, Recurring | Level 2 | Foreign exchange contracts
Assets
Derivative assets	90	169
Liabilities
Derivative liabilities	505	95
Fair Value, Measurements, Recurring | Level 2 | Purchased currency options
Assets
Derivative assets	37	104
Liabilities
Derivative liabilities	20	1
Fair Value, Measurements, Recurring | Level 2 | Commercial paper
Assets
Investments, debt securities	0	668
Fair Value, Measurements, Recurring | Level 2 | Corporate notes and bonds
Assets
Investments, debt securities	0	621
Fair Value, Measurements, Recurring | Level 2 | Asset-backed securities
Assets
Investments, debt securities	0	227
Fair Value, Measurements, Recurring | Level 2 | U.S. government and agency securities
Assets
Investments, debt securities	0	209
Other assets	0	0
Fair Value, Measurements, Recurring | Level 2 | Foreign government bonds
Assets
Investments, debt securities	5	0
Fair Value, Measurements, Recurring | Level 2 | Publicly traded equity securities
Assets
Publicly traded equity securities	0	0
Other assets	0	0
Fair Value, Measurements, Recurring | Level 3
Assets
Investments	0	0
Other assets	0	0
Derivative assets	0	0
Total assets	0	0
Liabilities
Contingent consideration	841	767
Derivative liabilities	0	0
Total liabilities	841	767
Fair Value, Measurements, Recurring | Level 3 | Interest rate swap contracts
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Level 3 | Foreign exchange contracts
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Level 3 | Purchased currency options
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Level 3 | Commercial paper
Assets
Investments, debt securities	0	0
Fair Value, Measurements, Recurring | Level 3 | Corporate notes and bonds
Assets
Investments, debt securities	0	0
Fair Value, Measurements, Recurring | Level 3 | Asset-backed securities
Assets
Investments, debt securities	0	0
Fair Value, Measurements, Recurring | Level 3 | U.S. government and agency securities
Assets
Investments, debt securities	0	0
Other assets	0	0
Fair Value, Measurements, Recurring | Level 3 | Foreign government bonds
Assets
Investments, debt securities	0	0
Fair Value, Measurements, Recurring | Level 3 | Publicly traded equity securities
Assets
Publicly traded equity securities	0	0
Other assets	$ 0	$ 0

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