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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Derivative instruments Derivative instruments (Summary of Income and Expense Line Items) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Interest and other income, net									$ 674	$ 928	$ 629
Interest expense, net									(1,392)	(1,304)	(1,260)
Amortization of cumulative amount of fair value hedging adjustments for discontinued hedging relationships									23
Interest rate swap agreements [Member]
Derivative [Line Items]
Gains (losses) on fair value hedging relationships, Hedged Items									65
Gains (losses) on fair value hedging relationships, Derivatives designated as hedging instruments									(42)
Reclassification out of Accumulated Other Comprehensive Income [Member] \| Cash flow hedges [Member] \| Cross-currency swap contracts [Member]
Derivative [Line Items]
Interest and other income, net									(241)
Product sales [Member]
Derivative [Line Items]
Product sales	$ 6,001	$ 5,510	$ 5,679	$ 5,343	$ 5,569	$ 5,453	$ 5,574	$ 5,199	22,533	$ 21,795	$ 21,892
Product sales [Member] \| Reclassification out of Accumulated Other Comprehensive Income [Member] \| Cash flow hedges [Member] \| Foreign currency contracts [Member]
Derivative [Line Items]
Product sales									$ (21)