Derivative Instruments - Effect of Derivative Contracts on Condensed Consolidated Statements of Income (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Total amounts presented in the condensed consolidated statements of income in which the effects of cash flow hedges are recorded	$ 4,618	$ 4,128
Designated as Hedging Instrument \| Cash Flow Hedging \| Foreign Exchange Contract \| Net Revenues
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses) recognized from foreign exchange contracts not designated as hedging instruments	42	52
Not Designated as Hedging Instrument \| Foreign Exchange Contract \| Other Income (Expense)
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses) recognized from foreign exchange contracts not designated as hedging instruments	$ 37	$ (10)

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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959

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No definition available.

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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