Revenues (Revenue by Geographic Location) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 41,159	$ 36,339
Hedging gains (losses)	49	137
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	18,870	16,532
EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	12,845	11,668
APAC
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	7,238	6,096
Other Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 2,157	$ 1,906
Geographic Concentration Risk \| Revenue Benchmark
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of total revenue	100.00%	100.00%
Geographic Concentration Risk \| Revenue Benchmark \| United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of total revenue	46.00%	45.00%
Geographic Concentration Risk \| Revenue Benchmark \| EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of total revenue	31.00%	33.00%
Geographic Concentration Risk \| Revenue Benchmark \| APAC
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of total revenue	18.00%	17.00%
Geographic Concentration Risk \| Revenue Benchmark \| Other Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of total revenue	5.00%	5.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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