Revenues (Revenue by Geographic Location) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Hedging gains (losses)	$ 176	$ 455	$ (138)
Total revenues	$ 182,527	$ 161,857	$ 136,819
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 from contract with customer	$ 85,014	$ 74,843	$ 63,269
United States \| Geographic Area \| Revenue
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of revenue	47.00%	46.00%	46.00%
EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues from contract with customer	$ 55,370	$ 50,645	$ 44,739
EMEA \| Geographic Area \| Revenue
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of revenue	30.00%	31.00%	33.00%
APAC
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues from contract with customer	$ 32,550	$ 26,928	$ 21,341
APAC \| Geographic Area \| Revenue
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of revenue	18.00%	17.00%	15.00%
Other Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues from contract with customer	$ 9,417	$ 8,986	$ 7,608
Other Americas \| Geographic Area \| Revenue
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of revenue	5.00%	6.00%	6.00%

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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