Amortization Of Deferred Gain (Loss) On Discontinuation Of Fair Value Hedge

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Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

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Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Derivative instruments (Summary of Income and Expense Line Items) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Interest and other income, net	$ 162	$ 165	$ 393	$ 360
Interest expense, net	(347)	(321)	(685)	(647)
Amortization of cumulative amount of fair value hedging adjustments for discontinued hedging relationships	7		15
Interest rate swap agreements [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on fair value hedging relationships, Hedged items	58		230
Gains (losses) on fair value hedging relationships, Derivatives designated as hedging instruments	(51)		(215)
Reclassification out of Accumulated Other Comprehensive Income [Member] \| Cash flow hedges [Member] \| Cross-currency swap contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest and other income, net	(298)		(134)
Product sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Product sales	5,679	$ 5,574	11,022	$ 10,773
Product sales [Member] \| Reclassification out of Accumulated Other Comprehensive Income [Member] \| Cash flow hedges [Member] \| Foreign currency contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Product sales	$ (20)		$ (54)