Benefit Plans (Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Foreign Plan [Member]
Components of Net Periodic Benefit Cost:
Service cost	$ 8	$ 12	$ 10
Interest cost	19	22	23
Expected return on plan assets	(14)	(17)	(21)
Amortization of prior service cost	0	0	0
Amortization of net loss	1	3	2
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment	0	0	0
Settlement loss recognized	0	4	0
Total pension cost	14	24	14
UNITED STATES
Components of Net Periodic Benefit Cost:
Service cost	11	15	13
Interest cost	44	40	41
Expected return on plan assets	(52)	(64)	(69)
Amortization of prior service cost	5	5	6
Amortization of net loss	15	18	18
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment	0	1	4
Settlement loss recognized	0	0	0
Total pension cost	$ 23	$ 15	$ 13