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Summary of Significant Accounting Policies - Schedule of Effect of New Accounting Pronouncements (Details) - USD ($) $ in Millions	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Prepaid and other current assets	$ 2,171	$ 1,757	$ 1,661
Other long-term assets	2,787	2,732	2,722
Other accrued liabilities	2,333	3,255	3,370
Other long-term obligations	594	589	558
Retained earnings	$ 20,706	19,202	$ 19,012
Difference Between Revenue Guidance In Effect Before And After Topic 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Prepaid and other current assets		96
Other long-term assets		10
Other accrued liabilities		(115)
Other long-term obligations		31
Retained earnings		$ 190

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