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Receivables, Net Receivables, Net (Schedule of Trade Receivables - Third Party and Affiliates, Net) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Receivables [Abstract]    
Trade receivables - third party and affiliates $ 859 $ 1,027
Allowance for doubtful accounts - third party and affiliates (9) (10)
Trade receivables - third party and affiliates, net $ 850 $ 1,017