Financial Instruments (Effects of Net Investment Hedges on Accumulated Other Comprehensive Losses) (Details) - Net Investment Hedging [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Accumulated Other Comprehensive Losses	$ 56	$ (33)
Gain Recognized in Net Earnings	9	8
Foreign currency contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Accumulated Other Comprehensive Losses	23	(33)
Gain Recognized in Net Earnings	9	8
Foreign Currency Denominated Debt [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Accumulated Other Comprehensive Losses	33	0
Gain Recognized in Net Earnings	$ 0	$ 0