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v3.22.2

Business Segment Information - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income | $ 700 | $ 346 | $ 1,349 | $ 686 |
(Benefit) provision for credit losses | 42 | (20) | 506 | (31) |
Net interest income after provision for credit losses | 658 | 366 | 843 | 717 |
Noninterest income | 424 | 133 | 1,274 | 270 |
Noninterest expenses | 745 | 300 | 1,555 | 597 |
Income (loss) before income taxes | 337 | 199 | 562 | 390 |
Income tax expense (benefit) | 82 | 46 | 36 | 90 |
Net income (loss) | 255 | 153 | 526 | 300 |
Total loans and leases | 67,735 | 32,690 | 67,735 | 32,690 | $ 32,372
Total deposits | 89,329 | 48,411 | 89,329 | 48,411 | 51,406
Operating lease equipment, net | 7,971 | 0 | 7,971 | 0 | $ 0
Operating Segments | General Banking |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income | 467 | 363 | 904 | 707 |
(Benefit) provision for credit losses | 7 | (21) | (8) | (32) |
Net interest income after provision for credit losses | 460 | 384 | 912 | 739 |
Noninterest income | 125 | 104 | 248 | 214 |
Noninterest expenses | 390 | 289 | 799 | 579 |
Income (loss) before income taxes | 195 | 199 | 361 | 374 |
Income tax expense (benefit) | 40 | 46 | 80 | 86 |
Net income (loss) | 155 | 153 | 281 | 288 |
Total loans and leases | 40,444 | 32,033 | 40,444 | 32,033 |
Total deposits | 83,535 | 48,344 | 83,535 | 48,344 |
Operating lease equipment, net | 0 | 0 | 0 | 0 |
Operating Segments | Commercial Banking |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income | 204 | 4 | 411 | 8 |
(Benefit) provision for credit losses | 35 | 1 | 1 | 1 |
Net interest income after provision for credit losses | 169 | 3 | 410 | 7 |
Noninterest income | 130 | 0 | 242 | 0 |
Noninterest expenses | 180 | 1 | 371 | 2 |
Income (loss) before income taxes | 119 | 2 | 281 | 5 |
Income tax expense (benefit) | 24 | 0 | 65 | 1 |
Net income (loss) | 95 | 2 | 216 | 4 |
Total loans and leases | 27,220 | 657 | 27,220 | 657 |
Total deposits | 4,449 | 66 | 4,449 | 66 |
Operating lease equipment, net | 724 | 0 | 724 | 0 |
Operating Segments | Rail |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income | (18) | 0 | (37) | 0 |
(Benefit) provision for credit losses | 0 | 0 | 0 | 0 |
Net interest income after provision for credit losses | (18) | 0 | (37) | 0 |
Noninterest income | 160 | 0 | 322 | 0 |
Noninterest expenses | 111 | 0 | 211 | 0 |
Income (loss) before income taxes | 31 | 0 | 74 | 0 |
Income tax expense (benefit) | 7 | 0 | 18 | 0 |
Net income (loss) | 24 | 0 | 56 | 0 |
Total loans and leases | 71 | 0 | 71 | 0 |
Total deposits | 11 | 0 | 11 | 0 |
Operating lease equipment, net | 7,247 | 0 | 7,247 | 0 |
Corporate |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income | 47 | (21) | 71 | (29) |
(Benefit) provision for credit losses | 0 | 0 | 513 | 0 |
Net interest income after provision for credit losses | 47 | (21) | (442) | (29) |
Noninterest income | 9 | 29 | 462 | 56 |
Noninterest expenses | 64 | 10 | 174 | 16 |
Income (loss) before income taxes | (8) | (2) | (154) | 11 |
Income tax expense (benefit) | 11 | 0 | (127) | 3 |
Net income (loss) | (19) | (2) | (27) | 8 |
Total loans and leases | 0 | 0 | 0 | 0 |
Total deposits | 1,334 | 1 | 1,334 | 1 |
Operating lease equipment, net | $ 0 | $ 0 | $ 0 | $ 0 |

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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=fcnca_GeneralBankingSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |