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Tax - Deferred tax reconciliation (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of net deferred tax asset    
At 1 January £ (610) £ (745)
Charge/(credit) to income statement (9) (31)
Charge/(credit) to other comprehensive income (224) 163
Currency translation and other adjustments 4 (6)
At 31 December (836) (610)
Discontinued operations    
Reconciliation of net deferred tax asset    
Charge/(credit) to income statement 3 9
Pension    
Reconciliation of net deferred tax asset    
At 1 January (4) (139)
Charge/(credit) to income statement 19 15
Charge/(credit) to other comprehensive income 10 119
Currency translation and other adjustments (1) 1
At 31 December 24 (4)
Accelerated capital allowances    
Reconciliation of net deferred tax asset    
At 1 January (64) 172
Charge/(credit) to income statement 21 (234)
Currency translation and other adjustments 1 (2)
At 31 December (42) (64)
Provisions    
Reconciliation of net deferred tax asset    
At 1 January (85) (118)
Charge/(credit) to income statement (5) 33
Charge/(credit) to other comprehensive income (7)  
At 31 December (97) (85)
Fair value of financial instruments    
Reconciliation of net deferred tax asset    
At 1 January 480 315
Charge/(credit) to income statement (10) 114
Charge/(credit) to other comprehensive income (222) 51
At 31 December 248 480
Total losses carried forward    
Reconciliation of net deferred tax asset    
At 1 January (905) (951)
Charge/(credit) to income statement (1) 46
Currency translation and other adjustments 4 (9)
At 31 December (899) (905)
Total losses carried forward | Discontinued operations    
Reconciliation of net deferred tax asset    
Charge/(credit) to income statement 3 9
Other    
Reconciliation of net deferred tax asset    
At 1 January (32) (24)
Charge/(credit) to income statement (33) (5)
Charge/(credit) to other comprehensive income (5) (7)
Currency translation and other adjustments   4
At 31 December £ (70) £ (32)