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Basis of Presentation - Narrative (Details) - CECL impact on Allowance for Credit Losses $ in Millions	Jan. 01, 2020 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan and Lease Losses, Period Increase (Decrease)	$ 3,100
PCD
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan and Lease Losses, Period Increase (Decrease)	(378)
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in Retained Earnings	$ 2,100

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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