Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts receivable, net of allowances	$ 7,289		$ 9,518
Accounts receivable, allowances for doubtful accounts	370		$ 206
Bad debt expense	$ 197	$ 4
United States \| Revenue from Contract with Customer Benchmark \| Geographic Concentration Risk
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk percentage	43.00%	42.00%

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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