Subsequent Events	12 Months Ended
Dec. 31, 2023
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On February 19, 2024, the Company and Capital One Financial Corporation jointly announced that they entered into an agreement and plan of merger (the “Merger Agreement”), under which the companies will combine in an all-stock merger, which values Discover at $35.3 billion. Under the terms of the Merger Agreement, holders of Discover common stock will receive 1.0192 shares of Capital One common stock for each share of Discover common stock they own. Capital One shareholders will own approximately 60% of the combined company and Discover shareholders will own approximately 40% of the combined company. The Merger Agreement contains customary representations and warranties, covenants and closing conditions. The Board of Directors of the combined company will have fifteen directors, consisting of the current twelve Capital One Board members and three of the Company’s Board members to be named at a later date.

Subsequent Events

12 Months Ended

Dec. 31, 2023

On February 19, 2024, the Company and Capital One Financial Corporation jointly announced that they entered into an agreement and plan of merger (the “Merger Agreement”), under which the companies will combine in an all-stock merger, which values Discover at $35.3 billion. Under the terms of the Merger Agreement, holders of Discover common stock will receive 1.0192 shares of Capital One common stock for each share of Discover common stock they own. Capital One shareholders will own approximately 60% of the combined company and Discover shareholders will own approximately 40% of the combined company. The Merger Agreement contains customary representations and warranties, covenants and closing conditions. The Board of Directors of the combined company will have fifteen directors, consisting of the current twelve Capital One Board members and three of the Company’s Board members to be named at a later date.