Revenues (Revenue by Geographic Location) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 161,857	$ 136,819	$ 110,855
Hedging gains (losses)	$ 455	$ (138)	$ (169)
Geographic Area \| Revenue
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of revenue	100.00%	100.00%	100.00%
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 74,843	$ 63,269	$ 52,449
United States \| Geographic Area \| Revenue
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of revenue	46.00%	46.00%	47.00%
EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 50,645	$ 44,739	$ 36,236
EMEA \| Geographic Area \| Revenue
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of revenue	31.00%	33.00%	33.00%
APAC
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 26,928	$ 21,341	$ 16,192
APAC \| Geographic Area \| Revenue
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of revenue	17.00%	15.00%	15.00%
Other Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 8,986	$ 7,608	$ 6,147
Other Americas \| Geographic Area \| Revenue
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of revenue	6.00%	6.00%	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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