Financial Instruments (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Derivative [Line Items]
Unrealized gain (loss) on hedges of net investments	$ (1,582)	$ 286
Gain on amounts excluded from effectiveness testing	56	56
Derivative Contract [Member]
Derivative [Line Items]
Notional amount	24,000
Derivative instruments, gains to be reclassified to earnings	$ 36
Derivative Contract [Member] \| Maximum [Member]
Derivative [Line Items]
Maximum length of time hedged in a cash flow hedge	21 months
Derivative Contract [Member] \| Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amount	$ 9,100
Gain on derivatives not designated as hedging instruments	56	(7)
Derivative Contract [Member] \| Cash Flow Hedging [Member]
Derivative [Line Items]
Notional amount	6,500
Derivative Contract [Member] \| Net Investment Hedging [Member]
Derivative [Line Items]
Notional amount	8,400
Unrealized gain (loss) on hedges of net investments	$ 314	$ 291

Gain (Loss) From Components Excluded From Assessment Of Net Investment Hedge Effectiveness, Net

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Nominal or face amount used to calculate payment on derivative.

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Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments.

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Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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