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Financial Instruments - Narrative (Details)	6 Months Ended
	Jun. 30, 2019 USD ($) interest_rate_swap	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Derivative [Line Items]
Number of interest rate swaps held (in interest rate swaps) | interest_rate_swap	19
Pretax net unrealized gain on derivatives maturing within next 12 months estimated to be reclassified from AOCI to sales	$ 76,000,000
Equity investments without readily determinable fair values	465,000,000
Unrealized gains recognized on investments in equity securities without readily determinable fair values	4,000,000
Unrealized losses recognized on investments in equity securities without readily determinable fair values	10,000,000
Cumulative unrealized gains on investments	172,000,000
Cumulative unrealized losses on investments	21,000,000
Available-for-sale debt securities included in Short-term investments	398,000,000
Available-for-sale debt securities maturing after one year through five years	3,400,000,000
Cash and cash equivalents	6,659,000,000		$ 7,965,000,000
Payments of contingent consideration	85,000,000	$ 235,000,000
Fair value of loans payable and long-term debt, including current portion	28,600,000,000		25,600,000,000
Debt, Long-term and Short-term, Combined Amount	26,600,000,000		25,100,000,000
Cash collateral received from counterparties	32,000,000		107,000,000
Cash collateral advanced to counterparties	0		$ 0
Significant Other Observable Inputs (Level 2)
Derivative [Line Items]
Cash and cash equivalents	6,700,000,000
Cash equivalents	$ 5,900,000,000
Derivatives Designated as Hedging Instruments | Maximum
Derivative [Line Items]
Maximum average period of maturities of contracts in years (less than)	2 years
Derivatives Not Designated as Hedging Instruments | Maximum
Derivative [Line Items]
Maximum average period of maturities of contracts in years (less than)	1 year
gefapixant
Derivative [Line Items]
Payments of contingent consideration		$ 175,000,000

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