Financial Instruments (Effects of Net Investment Hedges on Accumulated Other Comprehensive Losses) (Details) - Net Investment Hedging [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Accumulated Other Comprehensive Losses	$ (272)	$ 257	$ (243)	$ 238
Gain (Loss) Recognized in Net Earnings	8	10	33	26
Foreign currency contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Accumulated Other Comprehensive Losses	(66)	57	(28)	70
Gain (Loss) Recognized in Net Earnings	8	10	33	26
Foreign currency denominated debt [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Accumulated Other Comprehensive Losses	(206)	200	(215)	168
Gain (Loss) Recognized in Net Earnings	$ 0	$ 0	$ 0	$ 0