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Accounting Policies - Narrative (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Retained earnings $ (6,543) $ (6,574) $ (6,597)
Long term debt and finance leases 5,580 5,124 5,110
Property, plant and equipment, less accumulated depreciation 7,032 7,243 7,259
Deferred income taxes 1,839 1,854 1,847
Other liabilities, noncurrent $ 534 465 $ 471
Accounting Standards Update 2016-09      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Retained earnings   23  
Long term debt and finance leases   14  
Property, plant and equipment, less accumulated depreciation   (16)  
Deferred income taxes   7  
Other liabilities, noncurrent   $ (6)