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Financial Instruments - Cash Flow Hedges After-tax Gains/(Losses) (Details) - Cash flow hedges - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(losses), net of taxes, reclassified from accumulated other comprehensive income into earnings	$ 0	$ 14
Net derivative gains/(losses)	(69)	(32)
Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(losses), net of taxes, reclassified from accumulated other comprehensive income into earnings	0	14
Net derivative gains/(losses)	$ (69)	$ (32)

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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