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Proposed Separation Transaction - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 08, 2019
company
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Restructuring Cost and Reserve [Line Items]          
Number of independent, publicly-traded companies resulting from proposed separation transaction | company 2        
Restructuring and other charges (D)   $ 119 $ (2) $ 630 $ 20
Business separation | Proposed Separation Transaction | Selling, General and Administrative Expenses          
Restructuring Cost and Reserve [Line Items]          
Restructuring and other charges (D)   $ 25   $ 44