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Financial Instruments - maturity analysis - Contractual Maturity (Details) - GBP (£) £ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Financial instruments |  |
Contractual maturity period for undiscounted cash flows | 20 years |
Threshold period for principal amounts of financial liabilities to be excluded from contractual maturity for cash outflows | 20 years |
Threshold period for interest payments of financial liabilities to be excluded from contractual maturity for cash outflows | 20 years |
Financial Assets | £ 781,992 | £ 799,491
Financial Liabilities | 740,189 | 755,667
0-3 months | Financial assets |  |
Financial instruments |  |
Undiscounted cash flows, assets | 255,584 | 183,974
0-3 months | Cash and balances at central banks |  |
Financial instruments |  |
Undiscounted cash flows, assets | 177,757 | 124,489
0-3 months | Derivative held for hedging |  |
Financial instruments |  |
Undiscounted cash flows, assets | (23) | 14
0-3 months | Settlement balances |  |
Financial instruments |  |
Undiscounted cash flows, assets | 2,141 | 2,297
0-3 months | The loans and advances to banks |  |
Financial instruments |  |
Undiscounted cash flows, assets |  | 5,600
0-3 months | The loans and advances to customers |  |
Financial instruments |  |
Undiscounted cash flows, assets |  | 47,507
0-3 months | Financial assets (Other) |  |
Financial instruments |  |
Undiscounted cash flows, assets | 3,924 | 4,019
0-3 months | Finance lease |  |
Financial instruments |  |
Undiscounted cash flows, assets | 290 | 48
0-3 months | Financial liabilities |  |
Financial instruments |  |
Undiscounted cash flows, liabilities | 498,580 | 446,056
0-3 months | Deposits by banks |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 13,292 | 11,217
0-3 months | Customer accounts |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 473,123 | 421,763
0-3 months | Settlement balances liabilities |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 2,068 | 5,545
0-3 months | Derivatives held for hedging |  |
Financial instruments |  |
Undiscounted cash flows, derivative financial liabilities | (57) | 36
0-3 months | Financial liabilities (other) |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 6,967 | 4,716
0-3 months | Subordinated Liabilities |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 66 | 73
0-3 months | Notes in circulation |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 3,047 | 2,655
0-3 months | Lease liabilities. |  |
Financial instruments |  |
Undiscounted cash flows, derivative financial liabilities | 74 | 51
0-3 months | Guarantees and Commitments |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 120,591 | 124,166
0-3 months | Guarantees |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 2,055 | 2,244
0-3 months | Commitments |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 118,536 | 121,922
3-12 months | Financial assets |  |
Financial instruments |  |
Undiscounted cash flows, assets | 52,717 | 54,266
3-12 months | Derivative held for hedging |  |
Financial instruments |  |
Undiscounted cash flows, assets | (32) | 18
3-12 months | The loans and advances to banks |  |
Financial instruments |  |
Undiscounted cash flows, assets |  | 1,245
3-12 months | The loans and advances to customers |  |
Financial instruments |  |
Undiscounted cash flows, assets |  | 46,718
3-12 months | Financial assets (Other) |  |
Financial instruments |  |
Undiscounted cash flows, assets | 7,576 | 5,919
3-12 months | Finance lease |  |
Financial instruments |  |
Undiscounted cash flows, assets | 340 | 366
3-12 months | Financial liabilities |  |
Financial instruments |  |
Undiscounted cash flows, liabilities | 16,888 | 18,553
3-12 months | Deposits by banks |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 421 | 1,078
3-12 months | Customer accounts |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 5,440 | 8,528
3-12 months | Derivatives held for hedging |  |
Financial instruments |  |
Undiscounted cash flows, derivative financial liabilities | (31) | (17)
3-12 months | Financial liabilities (other) |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 9,293 | 8,144
3-12 months | Subordinated Liabilities |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 1,604 | 685
3-12 months | Lease liabilities. |  |
Financial instruments |  |
Undiscounted cash flows, derivative financial liabilities | 161 | 135
More than 1 year but less than 3 years | Financial assets |  |
Financial instruments |  |
Undiscounted cash flows, assets | 75,285 | 78,666
More than 1 year but less than 3 years | Derivative held for hedging |  |
Financial instruments |  |
Undiscounted cash flows, assets | 72 | 96
More than 1 year but less than 3 years | The loans and advances to customers |  |
Financial instruments |  |
Undiscounted cash flows, assets |  | 65,138
More than 1 year but less than 3 years | Financial assets (Other) |  |
Financial instruments |  |
Undiscounted cash flows, assets | 10,467 | 12,592
More than 1 year but less than 3 years | Finance lease |  |
Financial instruments |  |
Undiscounted cash flows, assets | 746 | 840
More than 1 year but less than 3 years | Financial liabilities |  |
Financial instruments |  |
Undiscounted cash flows, liabilities | 22,936 | 24,981
More than 1 year but less than 3 years | Deposits by banks |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 566 | 3,241
More than 1 year but less than 3 years | Customer accounts |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 1,155 | 1,407
More than 1 year but less than 3 years | Derivatives held for hedging |  |
Financial instruments |  |
Undiscounted cash flows, derivative financial liabilities | 561 | 94
More than 1 year but less than 3 years | Financial liabilities (other) |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 16,953 | 15,558
More than 1 year but less than 3 years | Subordinated Liabilities |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 3,481 | 4,387
More than 1 year but less than 3 years | Lease liabilities. |  |
Financial instruments |  |
Undiscounted cash flows, derivative financial liabilities | 220 | 294
More than 3 years but less than 5 years | Financial assets |  |
Financial instruments |  |
Undiscounted cash flows, assets | 53,624 | 70,142
More than 3 years but less than 5 years | Derivative held for hedging |  |
Financial instruments |  |
Undiscounted cash flows, assets | 15 |
More than 3 years but less than 5 years | The loans and advances to customers |  |
Financial instruments |  |
Undiscounted cash flows, assets |  | 58,680
More than 3 years but less than 5 years | Financial assets (Other) |  |
Financial instruments |  |
Undiscounted cash flows, assets | 8,048 | 10,791
More than 3 years but less than 5 years | Finance lease |  |
Financial instruments |  |
Undiscounted cash flows, assets | 504 | 671
More than 3 years but less than 5 years | Financial liabilities |  |
Financial instruments |  |
Undiscounted cash flows, liabilities | 24,630 | 20,223
More than 3 years but less than 5 years | Deposits by banks |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 12,003 | 5,038
More than 3 years but less than 5 years | Customer accounts |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 73 | 23
More than 3 years but less than 5 years | Derivatives held for hedging |  |
Financial instruments |  |
Undiscounted cash flows, derivative financial liabilities | 155 | 3
More than 3 years but less than 5 years | Financial liabilities (other) |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 10,062 | 11,470
More than 3 years but less than 5 years | Subordinated Liabilities |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 2,170 | 3,444
More than 3 years but less than 5 years | Lease liabilities. |  |
Financial instruments |  |
Undiscounted cash flows, derivative financial liabilities | 167 | 245
5-10 years | Financial assets |  |
Financial instruments |  |
Undiscounted cash flows, assets | 81,202 | 94,307
5-10 years | Derivative held for hedging |  |
Financial instruments |  |
Undiscounted cash flows, assets | 10 | 12
5-10 years | The loans and advances to banks |  |
Financial instruments |  |
Undiscounted cash flows, assets |  | 1
5-10 years | The loans and advances to customers |  |
Financial instruments |  |
Undiscounted cash flows, assets |  | 81,544
5-10 years | Financial assets (Other) |  |
Financial instruments |  |
Undiscounted cash flows, assets | 7,444 | 11,855
5-10 years | Finance lease |  |
Financial instruments |  |
Undiscounted cash flows, assets | 704 | 895
5-10 years | Financial liabilities |  |
Financial instruments |  |
Undiscounted cash flows, liabilities | 9,534 | 8,800
5-10 years | Customer accounts |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 4 | 26
5-10 years | Derivatives held for hedging |  |
Financial instruments |  |
Undiscounted cash flows, derivative financial liabilities | (152) | 64
5-10 years | Financial liabilities (other) |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 7,905 | 7,358
5-10 years | Subordinated Liabilities |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 1,496 | 923
5-10 years | Lease liabilities. |  |
Financial instruments |  |
Undiscounted cash flows, derivative financial liabilities | 281 | 429
10-20 years | Financial assets |  |
Financial instruments |  |
Undiscounted cash flows, assets | 96,032 | 94,590
10-20 years | Derivative held for hedging |  |
Financial instruments |  |
Undiscounted cash flows, assets | 17 | 6
10-20 years | The loans and advances to banks |  |
Financial instruments |  |
Undiscounted cash flows, assets |  | 110
10-20 years | The loans and advances to customers |  |
Financial instruments |  |
Undiscounted cash flows, assets |  | 88,155
10-20 years | Financial assets (Other) |  |
Financial instruments |  |
Undiscounted cash flows, assets | 5,523 | 5,774
10-20 years | Finance lease |  |
Financial instruments |  |
Undiscounted cash flows, assets | 377 | 545
10-20 years | Financial liabilities |  |
Financial instruments |  |
Undiscounted cash flows, liabilities | 927 | 1,331
10-20 years | Customer accounts |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 19 | 20
10-20 years | Derivatives held for hedging |  |
Financial instruments |  |
Undiscounted cash flows, derivative financial liabilities | (198) | (2)
10-20 years | Financial liabilities (other) |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 292 | 254
10-20 years | Subordinated Liabilities |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 563 | 562
10-20 years | Lease liabilities. |  |
Financial instruments |  |
Undiscounted cash flows, derivative financial liabilities | 251 | 497
Financial liabilities at fair value through profit or loss that meet definition of held for trading |  |
Financial instruments |  |
Financial Liabilities | 165,300 | 232,800
Financial liabilities at fair value through profit or loss that meet definition of held for trading | Financial Assets and Liabilities, Category |  |
Financial instruments |  |
Financial Liabilities | 165,433 | 232,961
Designated as at fair value through profit or loss [Member] |  |
Financial instruments |  |
Financial Assets | 165,614 | £ 235,953
Financial assets at amortised cost | 0-3 months | The loans and advances to banks |  |
Financial instruments |  |
Undiscounted cash flows, assets | 5,735 |
Financial assets at amortised cost | 0-3 months | The loans and advances to customers |  |
Financial instruments |  |
Undiscounted cash flows, assets | 65,760 |
Financial assets at amortised cost | 3-12 months | The loans and advances to banks |  |
Financial instruments |  |
Undiscounted cash flows, assets | 1,689 |
Financial assets at amortised cost | 3-12 months | The loans and advances to customers |  |
Financial instruments |  |
Undiscounted cash flows, assets | 43,144 |
Financial assets at amortised cost | More than 1 year but less than 3 years | The loans and advances to banks |  |
Financial instruments |  |
Undiscounted cash flows, assets | 21 |
Financial assets at amortised cost | More than 1 year but less than 3 years | The loans and advances to customers |  |
Financial instruments |  |
Undiscounted cash flows, assets | 63,979 |
Financial assets at amortised cost | More than 3 years but less than 5 years | The loans and advances to customers |  |
Financial instruments |  |
Undiscounted cash flows, assets | 45,057 |
Financial assets at amortised cost | 5-10 years | The loans and advances to customers |  |
Financial instruments |  |
Undiscounted cash flows, assets | 73,044 |
Financial assets at amortised cost | 10-20 years | The loans and advances to customers |  |
Financial instruments |  |
Undiscounted cash flows, assets | £ 90,115 |

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