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Summary of Significant Accounting Policies Newly Adopted Accounting Standards (Details) - USD ($) $ in Millions	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit loss	$ 15,564		$ 7,208
Retained earnings	40,088		40,340
Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred tax assets		$ 694
Retained earnings		2,200
Allowance for credit losses
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit loss	$ 15,564		$ 7,208	$ 7,220	$ 7,502
Finance charge and fee reserve reclassification		462
Allowance for credit losses \| Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit loss		$ 2,900