Financial Instruments (Effect of Derivative Instruments on Income and Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Fair Value of Derivatives Not Designated as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Recognized in Income on Derivatives	$ (201)	$ (82)
Foreign exchange contracts \| Other income (expense), net \| Fair Value of Derivatives Not Designated as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Recognized in Income on Derivatives	(202)	(74)
Interest rate contracts \| Other income (expense), net \| Fair Value of Derivatives Not Designated as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Recognized in Income on Derivatives	1	(8)
Derivatives in Cash Flow Hedging Relationship
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Reclassified from AOCI into Income (Effective Portion)	218	170
Derivatives in Cash Flow Hedging Relationship \| Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Recognized in OCI on Derivatives Before Tax Effect (Effective Portion)	(313)	33
Derivatives in Cash Flow Hedging Relationship \| Foreign exchange contracts \| Revenues
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Reclassified from AOCI into Income (Effective Portion)	217	169
Derivatives in Cash Flow Hedging Relationship \| Foreign exchange contracts \| Other income (expense), net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Recognized in Income on Derivatives (Amount Excluded from Effectiveness Testing and Ineffective Portion)	26	(139)
Derivatives in Cash Flow Hedging Relationship \| Interest rate contracts \| Other income (expense), net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Reclassified from AOCI into Income (Effective Portion)	1	1
Derivatives in Fair Value Hedging Relationship \| Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total	4	0
Derivatives in Fair Value Hedging Relationship \| Foreign exchange contracts \| Other income (expense), net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Recognized in Income on Derivatives, Foreign exchange contracts	(47)	(28)
Gains (Losses) Recognized in Income on Derivatives, Hedged item	$ 51	$ 28

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.

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

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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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4D
-Subparagraph (b)
-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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
-Subparagraph (a)(1),(2)
-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

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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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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

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Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period.

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