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Parent Company Financial Statements - Schedule of Condensed Statements of Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Expenses |  |  |
Interest expense | $ 3,679 | $ 467 | $ 61
Other expenses | 377 | 240 | 94
Income tax (benefit) expense | 611 | 264 | 154
Net income | 11,466 | 1,098 | 547
Preferred stock dividends | 59 | 50 | 18
Net income available to common stockholders, basic | 11,407 | 1,048 | 529
Net income available to common shareholders, diluted | 11,407 | 1,048 | 529
Parent |  |  |
Income |  |  |
Dividends from banking subsidiary | 367 | 1,410 | 173
Other (loss) income | (8) | (2) | 36
Total income | 359 | 1,408 | 209
Expenses |  |  |
Interest expense | 22 | 19 | 17
Other expenses | 40 | 26 | 11
Total expenses | 62 | 45 | 28
Income before income taxes and equity in undistributed net income of subsidiaries | 297 | 1,363 | 181
Income tax (benefit) expense | (14) | 44 | 2
Income before equity in undistributed net income of subsidiaries | 311 | 1,319 | 179
Equity in undistributed (distributed) net income of subsidiaries | 11,155 | (221) | 368
Net income | 11,466 | 1,098 | 547
Preferred stock dividends | 59 | 50 | 18
Net income available to common stockholders, basic | 11,407 | 1,048 | 529
Net income available to common shareholders, diluted | $ 11,407 | $ 1,048 | $ 529

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