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Financial Instruments - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Assets
Investments	$ 4,123	$ 7,261
Publicly traded equity securities	756	456
Derivative assets	301	454
Liabilities
Contingent consideration	753	788	$ 830	$ 935
Derivative liabilities	84	160
Corporate notes and bonds
Assets
Investments	2,700	4,920
Asset-backed securities
Assets
Investments	$ 792	1,275
Liabilities
Primary weighted average life of collateral	5 years
U.S. government and agency securities
Assets
Investments	$ 585	892
Foreign government bonds
Assets
Investments	41	166
Mortgage-backed securities
Assets
Investments	5	8
Fair Value, Measurements, Recurring
Assets
Investments	4,225	7,132
Other assets	654	585
Derivative assets	301	454
Total assets	5,180	8,171
Liabilities
Contingent consideration	753	788
Derivative liabilities	84	160
Total liabilities	837	948
Fair Value, Measurements, Recurring | Foreign exchange contracts
Assets
Derivative assets	129	241
Liabilities
Derivative liabilities	73	74
Fair Value, Measurements, Recurring | Interest rate swap contracts
Assets
Derivative assets	14	0
Fair Value, Measurements, Recurring | Currency options
Assets
Derivative assets	158	213
Liabilities
Derivative liabilities	3	5
Fair Value, Measurements, Recurring | Interest rate swap contracts
Liabilities
Derivative liabilities	8	81
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1)
Assets
Investments	228	147
Other assets	586	364
Derivative assets	0	0
Total assets	814	511
Liabilities
Contingent consideration	0	0
Derivative liabilities	0	0
Total liabilities	0	0
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) | Foreign exchange contracts
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) | Interest rate swap contracts
Assets
Derivative assets	0	0
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) | Currency options
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) | Interest rate swap contracts
Liabilities
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Investments	3,997	6,985
Other assets	68	221
Derivative assets	301	454
Total assets	4,366	7,660
Liabilities
Contingent consideration	0	0
Derivative liabilities	84	160
Total liabilities	84	160
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign exchange contracts
Assets
Derivative assets	129	241
Liabilities
Derivative liabilities	73	74
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swap contracts
Assets
Derivative assets	14	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Currency options
Assets
Derivative assets	158	213
Liabilities
Derivative liabilities	3	5
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swap contracts
Liabilities
Derivative liabilities	8	81
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Assets
Investments	0	0
Other assets	0	0
Derivative assets	0	0
Total assets	0	0
Liabilities
Contingent consideration	753	788
Derivative liabilities	0	0
Total liabilities	753	788
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Foreign exchange contracts
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Interest rate swap contracts
Assets
Derivative assets	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Currency options
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Interest rate swap contracts
Liabilities
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Corporate notes and bonds
Assets
Investments	2,660	4,835
Other assets	40	85
Fair Value, Measurements, Recurring | Corporate notes and bonds | Quoted Prices In Active Markets for Identical Assets (Level 1)
Assets
Investments	0	0
Other assets	0	0
Fair Value, Measurements, Recurring | Corporate notes and bonds | Significant Other Observable Inputs (Level 2)
Assets
Investments	2,660	4,835
Other assets	40	85
Fair Value, Measurements, Recurring | Corporate notes and bonds | Significant Unobservable Inputs (Level 3)
Assets
Investments	0	0
Other assets	0	0
Fair Value, Measurements, Recurring | Asset-backed securities
Assets
Investments	788	1,253
Other assets	4	22
Fair Value, Measurements, Recurring | Asset-backed securities | Quoted Prices In Active Markets for Identical Assets (Level 1)
Assets
Investments	0	0
Other assets	0	0
Fair Value, Measurements, Recurring | Asset-backed securities | Significant Other Observable Inputs (Level 2)
Assets
Investments	788	1,253
Other assets	4	22
Fair Value, Measurements, Recurring | Asset-backed securities | Significant Unobservable Inputs (Level 3)
Assets
Investments	0	0
Other assets	0	0
Fair Value, Measurements, Recurring | U.S. government and agency securities
Assets
Investments	508	731
Other assets	77	161
Fair Value, Measurements, Recurring | U.S. government and agency securities | Quoted Prices In Active Markets for Identical Assets (Level 1)
Assets
Investments	0	0
Other assets	58	55
Fair Value, Measurements, Recurring | U.S. government and agency securities | Significant Other Observable Inputs (Level 2)
Assets
Investments	508	731
Other assets	19	106
Fair Value, Measurements, Recurring | U.S. government and agency securities | Significant Unobservable Inputs (Level 3)
Assets
Investments	0	0
Other assets	0	0
Fair Value, Measurements, Recurring | Foreign government bonds
Assets
Investments	41	166
Fair Value, Measurements, Recurring | Foreign government bonds | Quoted Prices In Active Markets for Identical Assets (Level 1)
Assets
Investments	0	0
Fair Value, Measurements, Recurring | Foreign government bonds | Significant Other Observable Inputs (Level 2)
Assets
Investments	41	166
Fair Value, Measurements, Recurring | Foreign government bonds | Significant Unobservable Inputs (Level 3)
Assets
Investments	0	0
Fair Value, Measurements, Recurring | Mortgage-backed securities
Assets
Other assets	5	8
Fair Value, Measurements, Recurring | Mortgage-backed securities | Quoted Prices In Active Markets for Identical Assets (Level 1)
Assets
Other assets	0	0
Fair Value, Measurements, Recurring | Mortgage-backed securities | Significant Other Observable Inputs (Level 2)
Assets
Other assets	5	8
Fair Value, Measurements, Recurring | Mortgage-backed securities | Significant Unobservable Inputs (Level 3)
Assets
Other assets	0	0
Fair Value, Measurements, Recurring | Publicly traded equity securities
Assets
Publicly traded equity securities	228	147
Other assets	528	309
Fair Value, Measurements, Recurring | Publicly traded equity securities | Quoted Prices In Active Markets for Identical Assets (Level 1)
Assets
Publicly traded equity securities	228	147
Other assets	528	309
Fair Value, Measurements, Recurring | Publicly traded equity securities | Significant Other Observable Inputs (Level 2)
Assets
Publicly traded equity securities	0	0
Other assets	0	0
Fair Value, Measurements, Recurring | Publicly traded equity securities | Significant Unobservable Inputs (Level 3)
Assets
Publicly traded equity securities	0	0
Other assets	$ 0	$ 0

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