Financial Instruments (Effects of Net Investment Hedges on Accumulated Other Comprehensive Losses) (Details) - Net Investment Hedging [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Accumulated Other Comprehensive Losses	$ (73)	$ (104)	$ 168	$ 29
Gain (Loss) Recognized in Net Earnings	2	11	7	25
Foreign currency contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Accumulated Other Comprehensive Losses	(19)	(18)	16	38
Gain (Loss) Recognized in Net Earnings	2	11	7	25
Foreign currency denominated debt [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Accumulated Other Comprehensive Losses	(54)	(86)	152	(9)
Gain (Loss) Recognized in Net Earnings	$ 0	$ 0	$ 0	$ 0