Financial Instruments (Derivative Notional Amounts) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Foreign exchange contracts \| Fair Value of Derivatives Not Designated as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Notional principal	$ 41,031	$ 39,861
Foreign exchange contracts \| Cash flow hedges \| Fair Value of Derivatives Designated as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Notional principal	16,362	10,187
Foreign exchange contracts \| Fair value hedges \| Fair Value of Derivatives Designated as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Notional principal	2,556	1,569
Foreign exchange contracts \| Net investment hedges \| Fair Value of Derivatives Designated as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Notional principal	10,159	9,965
Other contracts \| Fair Value of Derivatives Not Designated as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Notional principal	$ 4,275	$ 2,399