Financial Instruments (Forms of Hedging) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Cash Flow Hedges [Member]
Derivative [Line Items]
Fair value of derivatives increase (decrease)	$ 22	$ (56)
Shareowners' equity (increase) decrease	(22)	57
Net effect on earnings (loss) (hedge ineffectiveness)	0	1
Earnings (loss) effect of derivatives	(1)	(84)
Fair Value Hedges [Member]
Derivative [Line Items]
Fair value of derivatives increase (decrease)	(225)	1,723
Adjustment to carrying amount of hedged debt increase (decrease)	163	(1,754)
Earnings (loss) related to hedge ineffectiveness	(62)	(32)
Net Investment Hedges [Member]
Derivative [Line Items]
Fair value of derivatives increase (decrease)	(563)	602
Fair value of derivatives increase (decrease) for NIH	(92)	329
Fair value of non-derivatives (increase) decrease	(471)	273
Shareowners' equity (increase) decrease	573	(569)
Earnings (loss) (spot-forward difference on derivatives)	10	32
Earnings (loss) effect of derivatives	60	(693)
Economic Hedges [Member]
Derivative [Line Items]
Fair value of derivatives increase (decrease)	(339)	(278)
Change in carrying amount of item being hedged increase (decrease)	224	87
Earnings (loss) effect of derivatives	$ (115)	$ (191)

Change in carrying amount of item being hedged increase (decrease)

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Fair value of derivatives increase (decrease) for NIH to keep instruments separate

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959

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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624177-113959

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The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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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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The net gain (loss) recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness.

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Amount of gain (loss)recognized in the income statement from the hedging ineffectiveness of a fair value hedge.

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