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Description of Business, Basis of Presentation, and Significant Accounting Policies (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Troubled debt restructuring threshold	10.00%
Equity	$ (14,703)	$ (14,416)	$ (13,268)	$ (13,494)
Allowance for loan losses	$ 3,283	1,263	1,242
Phase-in of capital impact of Accounting Standards Update 2016-13	25.00%
CECL scaling factor	25.00%
Accumulated Deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity	$ 4,278	4,057	$ 5,489	$ 6,406
Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Phase-in of capital impact of Accounting Standards Update 2016-13	25.00%
CECL scaling factor	25.00%
Accounting Standards Update 2016-13 \| Revision of Prior Period, Accounting Standards Update, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity		1,017
Accounting Standards Update 2016-13 \| Revision of Prior Period, Accounting Standards Update, Adjustment \| Accumulated Deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity		1,017
Allowance for loan losses		$ 1,346

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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