Acquisitions (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	$ 2,000
Cash Acquired from Acquisition	95
Business Acquisition, Purchase Price Allocation, Working Capital	157
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment	438
Goodwill	858
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	706
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	92
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities	(307)
Payments to Acquire Businesses, Net of Cash Acquired	1,944	$ 0
Business Acquisition, Goodwill, Expected Tax Deductible Amount	$ 90
Gleadell [Member]
Business Acquisition [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	50.00%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value	$ 15
Business Acquisition, Purchase Price Allocation, Working Capital	(6)
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment	13
Goodwill	10
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	9
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities	(11)
Payments to Acquire Businesses, Net of Cash Acquired	15
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain	3
Neovia [Member]
Business Acquisition [Line Items]
Business Acquisition, Purchase Price Allocation, Working Capital	103
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment	405
Goodwill	731
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	659
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	82
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities	(289)
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination	1,691
FCC [Member]
Business Acquisition [Line Items]
Business Acquisition, Purchase Price Allocation, Working Capital	40
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment	17
Goodwill	90
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	23
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities	0
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination	170
Ziegler [Member]
Business Acquisition [Line Items]
Business Acquisition, Purchase Price Allocation, Working Capital	20
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment	3
Goodwill	27
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	24
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	1
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities	(7)
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination	$ 68