Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	Sep. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
Retained Earnings (Accumulated Deficit)	$ (70,015)	$ (74,428)	$ (74,188)
Accounting Standards Update 2016-13
Retained Earnings (Accumulated Deficit)		$ (240)

The cumulative amount of the reporting entity's undistributed earnings or deficit.

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