Recent Accounting Guidance Lease ASU - Effect on Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	[1]	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, Plant and Equipment, Net	$ 4,546		$ 4,544		$ 4,648
Other Assets	2,326		1,932
Total Non-Current Assets - Discontinued Operations	0		56,545
Short-term borrowings and finance lease obligations	7		2,154
Accrued and other current liabilities	4,434		4,005
Total Current Liabilities - Discontinued Operations	0		3,167
Long-term Debt	115		5,784
Other noncurrent obligations	2,192		1,795
Non-current Liabilities - Discontinued Operations	$ 0		$ 5,484
Effect of Adoption of ASU 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, Plant and Equipment, Net		$ 9
Other Assets		546
Total Non-Current Assets - Discontinued Operations		461
Short-term borrowings and finance lease obligations		1
Accrued and other current liabilities		143
Total Current Liabilities - Discontinued Operations		141
Long-term Debt		8
Other noncurrent obligations		403
Non-current Liabilities - Discontinued Operations		320
Updated [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, Plant and Equipment, Net		4,553
Other Assets		2,478
Total Non-Current Assets - Discontinued Operations		57,006
Short-term borrowings and finance lease obligations		2,155
Accrued and other current liabilities		4,148
Total Current Liabilities - Discontinued Operations		3,308
Long-term Debt		5,792
Other noncurrent obligations		2,198
Non-current Liabilities - Discontinued Operations		$ 5,804

[1] Includes adjustments for discontinued operations and common control business combination.