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Summary of Significant Accounting Policies (Pension and Other Postretirement Benefit Costs) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cost of products sold, excluding depreciation and amortization $ 9,028 $ 7,006 $ 6,623
Selling and administrative expense 558 367 366
Restructuring and other 44 51 30
Other pension and postretirement $ (25) (53) (24)
ASU 2017-07      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cost of products sold, excluding depreciation and amortization   54 40
Selling and administrative expense   (4) (2)
Restructuring and other   3 (14)
Other pension and postretirement   $ (53) $ (24)