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Financial Instruments - Cash Flow Hedges After-tax Gains/(Losses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized (loss)/gain in fair value	$ 43	$ 25	$ (88)	$ 5
Cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized (loss)/gain in fair value	(68)	25	(211)	14
Interest rate contracts | Cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
After-tax gains (losses) reclassified from accumulated other comprehensive income into earnings/(losses)	(111)	0	(123)	9
Unrealized (loss)/gain in fair value	(68)	25	(214)	14
Currency exchange contracts | Forecasted transactions | Cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized (loss)/gain in fair value	$ 0	$ 0	$ 3	$ 0

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Amount, after tax and reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
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Amount, after tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e689-108580

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580

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