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Retirement-Related Benefits - OCI and AOCI (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2012
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Changes in AOCI for retirement-related benefits          
Current period loss/(gain)     $ 2,517 $ (682) $ 2,490
Curtailments and settlements     (11) (19) 16
Amortization of net loss included in net periodic (income)/cost     (2,966) (2,889) (2,764)
Current period prior service costs/(credits)     182 0  
Amortization of prior service (costs)/credits included in net periodic (income)/cost     73 88 107
Pension Plans | U.S.          
Changes in AOCI for retirement-related benefits          
Net loss at beginning of period     18,045 19,222  
Current period loss/(gain)     956 159  
Amortization of net loss included in net periodic (income)/cost     (1,525) (1,337)  
Net loss at end of period $ 19,222   17,476 18,045 19,222
Prior service costs/(credits) at beginning of period     74 90  
Amortization of prior service (costs)/credits included in net periodic (income)/cost     (16) (16)  
Prior service costs/(credits) at end of period 90   57 74 90
Total loss recognized in accumulated other comprehensive income/(loss)     17,533 18,119  
Amounts that will be amortized from AOCI into net periodic (income)/cost          
Estimated net loss that will be amortized from AOCI into net periodic cost     560    
Estimated prior service costs/(credits) that will be amortized from AOCI into net periodic (income)/cost     16    
Pension Plans | Non-U.S.          
Changes in AOCI for retirement-related benefits          
Net loss at beginning of period     18,275 20,544  
Current period loss/(gain)     1,590 (740)  
Curtailments and settlements     (11) (22)  
Amortization of net loss included in net periodic (income)/cost     (1,401) (1,507)  
Net loss at end of period 20,544   18,452 18,275 20,544
Prior service costs/(credits) at beginning of period     (90) (188)  
Current period prior service costs/(credits)     181    
Curtailments, settlements and other     0 1  
Amortization of prior service (costs)/credits included in net periodic (income)/cost     83 97  
Prior service costs/(credits) at end of period (188)   172 (90) (188)
Transition (assets)/liabilities at beginning of period     0 0  
Amortization of transition assets/(liabilities) included in net periodic (income)/cost       0  
Transition (assets)/liabilities at end of period 0   0 0 0
Total loss recognized in accumulated other comprehensive income/(loss)     18,624 18,184  
Amounts that will be amortized from AOCI into net periodic (income)/cost          
Estimated net loss that will be amortized from AOCI into net periodic cost     1,261    
Estimated prior service costs/(credits) that will be amortized from AOCI into net periodic (income)/cost     (26)    
Retirement-related plans cost          
Other costs     16 (76) 84
Nonpension Postretirement Plans | U.S.          
Changes in AOCI for retirement-related benefits          
Net loss at beginning of period     486 605  
Current period loss/(gain)     (72) (99)  
Amortization of net loss included in net periodic (income)/cost     (10) (20)  
Net loss at end of period 605   405 486 605
Prior service costs/(credits) at beginning of period     45 37  
Amortization of prior service (costs)/credits included in net periodic (income)/cost     7 7  
Prior service costs/(credits) at end of period 37   52 45 37
Total loss recognized in accumulated other comprehensive income/(loss)     457 531  
Amounts that will be amortized from AOCI into net periodic (income)/cost          
Estimated net loss that will be amortized from AOCI into net periodic cost     2    
Estimated prior service costs/(credits) that will be amortized from AOCI into net periodic (income)/cost     (2)    
Nonpension Postretirement Plans | Non-U.S.          
Changes in AOCI for retirement-related benefits          
Net loss at beginning of period     145 154  
Current period loss/(gain)     33 (2)  
Curtailments and settlements     0 0  
Amortization of net loss included in net periodic (income)/cost     (6) (7)  
Net loss at end of period 154   172 145 154
Prior service costs/(credits) at beginning of period     3 1  
Current period prior service costs/(credits)     1    
Curtailments, settlements and other     0 2  
Amortization of prior service (costs)/credits included in net periodic (income)/cost     0 0  
Prior service costs/(credits) at end of period 1   4 3 1
Transition (assets)/liabilities at beginning of period     0 0  
Amortization of transition assets/(liabilities) included in net periodic (income)/cost     0 0  
Transition (assets)/liabilities at end of period 0   0 0 0
Total loss recognized in accumulated other comprehensive income/(loss)     176 147  
Amounts that will be amortized from AOCI into net periodic (income)/cost          
Estimated net loss that will be amortized from AOCI into net periodic cost     11    
Estimated prior service costs/(credits) that will be amortized from AOCI into net periodic (income)/cost     0    
Lloyds Pension Group Trustees v Lloyds Bank | Pension Plans | UK          
Changes in AOCI for retirement-related benefits          
Current period prior service costs/(credits)     $ 125    
Increase in PBO recorded as prior service cost, as percentage of total PBO     1.00%    
Litigation in Spain regarding defined benefit and defined contribution plans | Pension Plans | Non-U.S.          
Retirement-related plans cost          
Other costs $ 56   $ 0 0 $ 56
Other costs - income statement location us-gaap:SellingGeneralAndAdministrativeExpense       us-gaap:SellingGeneralAndAdministrativeExpense
Litigation in United Kingdom regarding defined benefit plans | Pension Plans | Non-U.S.          
Retirement-related plans cost          
Other costs   $ 162   $ (91)  
Other costs - income statement location   us-gaap:SellingGeneralAndAdministrativeExpense   us-gaap:SellingGeneralAndAdministrativeExpense