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Summary of Significant Accounting Policies (Schedule of Trade Receivable) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Summary of trade receivables, net
Trade receivables	$ 3,302	$ 1,489
Allowance for doubtful accounts	(60)	(17)	$ (63)	$ (41)
Total Trade receivables, net	$ 3,242	$ 1,472

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