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Parent Company Financial Information - Statements of Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |  |
Net income attributable to controlling interest | $ 999 | $ 845 | $ 441
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |
Depreciation, amortization, and other | 28 | 46 | 65
Deferred income tax expense (benefit) | 0 | (18) | 14
Stock-based compensation expense | 43 | 32 | 22
Loss on extinguishment of debt | 26 | 0 | 0
Total adjustments | (269) | (685) | 378
Net cash provided by (used in) operating activities | 741 | 172 | 830
Securities: |  |  |
Proceeds from sales and prepayments of securities | 68 | 629 | 192
Purchases of securities |  |  |
Net cash provided by (used in) investing activities | (4,617) | (4,967) | (2,390)
Preferred stock: |  |  |
Proceeds from issuance of preferred stock | 145 | 144 | 0
Call of preferred stock | (100) | 0 | 0
Cash dividends paid - preferred stock | (33) | (17) | (6)
Common stock: |  |  |
Stock options exercised | 28 | 7 | 9
Cash dividends paid | (333) | (222) | (171)
Repurchase of shares | (416) | (4) | (134)
Term borrowings: |  |  |
Repayment of term borrowings | (108) | (327) | (396)
Net cash provided by (used in) financing activities | 4,016 | 5,176 | 1,422
Net increase (decrease) in cash and cash equivalents | 140 | 381 | (138)
Cash and cash equivalents at beginning of period | 1,648 | 1,267 | 1,405
Cash and cash equivalents at end of period | 1,788 | 1,648 | 1,267
Total interest paid | 170 | 261 | 411
Income taxes received from subsidiaries | 258 | 105 | 71
Parent Company |  |  |
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |  |
Net income attributable to controlling interest | 999 | 845 | 441
Less undistributed net income of subsidiaries | 340 | 740 | 158
Income before undistributed net income of subsidiaries | 659 | 105 | 283
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |
Depreciation, amortization, and other | 0 | 0 | (1)
(Gain) loss on derivative transactions | 0 | 4 | 0
Deferred income tax expense (benefit) | 8 | 5 | 4
Stock-based compensation expense | 43 | 32 | 22
Loss on extinguishment of debt | 26 | 0 | 0
Other operating activities, net | (11) | 21 | 28
Total adjustments | 66 | 62 | 53
Net cash provided by (used in) operating activities | 725 | 167 | 336
Securities: |  |  |
Proceeds from sales and prepayments of securities | 3 | 0 | 1
Purchases of securities |  |  |
Purchases of securities | (10) | (5) | 0
Sales (purchases) of premises and equipment | 8 | (2) | 0
Cash received for business combination, net | 0 | 103 | 0
Net cash provided by (used in) investing activities | 1 | 96 | 1
Preferred stock: |  |  |
Proceeds from issuance of preferred stock | 145 | 144 | 0
Call of preferred stock | (100) | 0 | 0
Cash dividends paid - preferred stock | (33) | (17) | (6)
Common stock: |  |  |
Stock options exercised | 28 | 7 | 9
Cash dividends paid | (333) | (222) | (171)
Repurchase of shares | (416) | (4) | (134)
Proceeds from issuance of term borrowings | 0 | 795 | 0
Term borrowings: |  |  |
Repayment of term borrowings | (120) | (500) | 0
Other financing activities, net | 0 | (8) | 0
Net cash provided by (used in) financing activities | (829) | 195 | (302)
Net increase (decrease) in cash and cash equivalents | (103) | 458 | 35
Cash and cash equivalents at beginning of period | 827 | 369 | 334
Cash and cash equivalents at end of period | 724 | 827 | 369
Total interest paid | 35 | 33 | 29
Income taxes received from subsidiaries | $ 28 | $ 33 | $ 43

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