Acquisitions (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Feb. 28, 2019
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired			50.00%
Payments to Acquire Businesses, Gross	$ 2,000
Cash Acquired from Acquisition	95
Business Acquisition, Purchase Price Allocation, Working Capital	156
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment	417
Goodwill	857
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	743
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	92
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities	(319)
Payments to Acquire Businesses, Net of Cash Acquired	1,946	$ 324
Business Acquisition, Goodwill, Expected Tax Deductible Amount	90
Gleadell [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired			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	4
Neovia [Member]
Business Acquisition [Line Items]
Business Acquisition, Purchase Price Allocation, Working Capital	104
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment	384
Goodwill	739
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	679
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	83
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities	(297)
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination	1,692
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	85
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	29
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities	(1)
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	18
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment	3
Goodwill	23
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	35
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities	(10)
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination	$ 69