Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity investments	$ 6,164		$ 6,164		$ 86
Accounts receivable, net of allowances	8,024		8,024		9,518
Accounts receivable, allowances for doubtful accounts	$ 311		$ 311		$ 206
United States \| Revenue from Contract with Customer Benchmark \| Geographic Concentration Risk
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk percentage	41.00%	43.00%	42.00%	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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