Recent Accounting Guidance Leasing ASU - Balance Sheet Impact of Adoption (Details) - USD ($) $ in Millions	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, plant and equipment, net of accumulated depreciation	$ 12,083		$ 12,186
Other Assets	2,476		1,810
Short-term borrowings and finance lease obligations	3,205		2,160
Accrued and other current liabilities	4,400		4,233
Long-term Debt	6,320		5,812
Other noncurrent obligations	$ 2,052		1,620
As Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, plant and equipment, net of accumulated depreciation			12,186
Other Assets			1,810
Short-term borrowings and finance lease obligations			2,160
Accrued and other current liabilities			4,233
Long-term Debt			5,812
Other noncurrent obligations			$ 1,620
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, plant and equipment, net of accumulated depreciation		$ 9
Other Assets		758
Short-term borrowings and finance lease obligations		1
Accrued and other current liabilities		234
Long-term Debt		8
Other noncurrent obligations		524
Updated [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, plant and equipment, net of accumulated depreciation		12,195
Other Assets		2,568
Short-term borrowings and finance lease obligations		2,161
Accrued and other current liabilities		4,467
Long-term Debt		5,820
Other noncurrent obligations		$ 2,144