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Components of Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance |  | $ 8,547 | $ 8,494 |  | $ 8,307 |
Net unrealized gains (losses) |  | 121 | (1,103) |  | (149) |
Amounts reclassified from AOCI |  | 59 | 23 |  | 1 |
Other comprehensive income (loss) |  | 180 | (1,080) |  | (148) |
Ending balance |  | 9,291 | 8,547 |  | 8,494 |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance | [1] | (1,368) | (288) |  | (140) |
Other comprehensive income (loss) |  | 180 | (1,080) | [1] | (148) | [1]
Ending balance | [1] | (1,188) | (1,368) |  | (288) |
Securities AFS |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance |  | (973) | (36) |  | 108 |
Net unrealized gains (losses) |  | 137 | (937) |  | (144) |
Amounts reclassified from AOCI |  | 0 | 0 |  | 0 |
Other comprehensive income (loss) |  | 137 | (937) |  | (144) |
Ending balance |  | (836) | (973) |  | (36) |
Cash Flow Hedges |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance |  | (127) | 2 |  | 12 |
Net unrealized gains (losses) |  | (5) | (144) |  | (3) |
Amounts reclassified from AOCI |  | 52 | 15 |  | (7) |
Other comprehensive income (loss) |  | 47 | (129) |  | (10) |
Ending balance |  | (80) | (127) |  | 2 |
Pension and Post-retirement Plans |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance |  | (268) | (254) |  | (260) |
Net unrealized gains (losses) |  | (11) | (22) |  | (2) |
Amounts reclassified from AOCI |  | 7 | 8 |  | 8 |
Other comprehensive income (loss) |  | (4) | (14) |  | 6 |
Ending balance |  | $ (272) | $ (268) |  | $ (254) |
[1] | Due to the nature of the preferred stock issued by FHN and its subsidiaries, all components of other comprehensive income (loss) have been attributed solely to FHN as the controlling interest holder.

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