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Introduction, Presentation, and Other Information - Changed Accounting Policy (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2017
Jun. 30, 2018
Jan. 02, 2018
Disclosure of initial application of standards or interpretations [line items]      
Financial assets available-for-sale € 133,271    
Held-to-maturity investments 13,491    
Loans and receivables 903,013    
Financial assets held for trading 125,458 € 112,947 € 125,618
Financial assets at fair value through profit or loss, designated upon initial recognition or subsequently 34,782 48,043 42,075
Financial liabilities at fair value through profit or loss that meet definition of held for trading 107,624 75,350 107,634
Non-trading financial assets mandatorily at fair value through profit or loss   5,263 4,672
Financial assets measured at fair value through other comprehensive income   120,831 126,353
Financial assets at amortised cost   922,948 909,409
Provisions 14,489 13,758 14,686
Investments in joint ventures 1,987 2,047  
Under IAS 39 Before Adjustment For Impairment [Member] | Impairment losses      
Disclosure of initial application of standards or interpretations [line items]      
Financial assets at amortised cost (24,682)    
Total impairment impact (25,299)    
Under IFRS 9 After Adjustment For Impairment [Member] | Impairment losses      
Disclosure of initial application of standards or interpretations [line items]      
Financial assets measured at fair value through other comprehensive income     (2)
Financial assets at amortised cost     (26,656)
Total impairment impact     (27,472)
Increase Decrease Due To Initial Adoption Of IFRS 9 Related To Naming Modifications [Member]      
Disclosure of initial application of standards or interpretations [line items]      
Financial assets available-for-sale     (124,229)
Loans and receivables     (890,094)
Financial assets at fair value through profit or loss, designated upon initial recognition or subsequently     (933)
Non-trading financial assets mandatorily at fair value through profit or loss     933
Financial assets measured at fair value through other comprehensive income     124,229
Financial assets at amortised cost     890,094
Increase Decrease Due To Initial Adoption Of IFRS 9 Related To Classification And Measurement [Member]      
Disclosure of initial application of standards or interpretations [line items]      
Financial assets available-for-sale     (9,042)
Held-to-maturity investments     (13,491)
Loans and receivables     (12,927)
Financial assets held for trading     160
Financial assets at fair value through profit or loss, designated upon initial recognition or subsequently     8,226
Financial liabilities at fair value through profit or loss that meet definition of held for trading     10
Non-trading financial assets mandatorily at fair value through profit or loss     3,739
Financial assets measured at fair value through other comprehensive income     2,126
Financial assets at amortised cost     21,297
Increase Decrease Due To Initial Adoption Of IFRS 9 Related To Impairment [Member]      
Disclosure of initial application of standards or interpretations [line items]      
Loans and receivables     8
Financial assets measured at fair value through other comprehensive income     (2)
Financial assets at amortised cost     (1,982)
Provisions     197
Increase Decrease Due To Initial Adoption Of IFRS 9 Related To Impairment [Member] | Impairment losses      
Disclosure of initial application of standards or interpretations [line items]      
Financial assets measured at fair value through other comprehensive income     (2)
Financial assets at amortised cost     (1,974)
Total impairment impact     (2,173)
Investments in joint ventures     (34)
Derivatives      
Disclosure of initial application of standards or interpretations [line items]      
Financial liabilities at fair value through profit or loss that meet definition of held for trading 57,892 54,892 57,902
Derivatives | Under IAS 39 Before Adjustment For Classification And Measurement [Member]      
Disclosure of initial application of standards or interpretations [line items]      
Financial liabilities at fair value through profit or loss that meet definition of held for trading 10    
Derivatives | Under IFRS 9 After Adjustment For Classification And Measurement [Member]      
Disclosure of initial application of standards or interpretations [line items]      
Financial liabilities at fair value through profit or loss that meet definition of held for trading     10
Derivatives | Increase Decrease Due To Initial Adoption Of IFRS 9 Related To Classification And Measurement [Member]      
Disclosure of initial application of standards or interpretations [line items]      
Financial liabilities at fair value through profit or loss that meet definition of held for trading     10
Derivatives      
Disclosure of initial application of standards or interpretations [line items]      
Financial assets held for trading 57,243 55,997 57,243
Equity instruments      
Disclosure of initial application of standards or interpretations [line items]      
Financial assets available-for-sale 4,790    
Financial assets held for trading 21,353 17,670 21,353
Financial assets at fair value through profit or loss, designated upon initial recognition or subsequently 933    
Non-trading financial assets mandatorily at fair value through profit or loss   2,956 2,584
Financial assets measured at fair value through other comprehensive income   2,766 3,169
Equity instruments | Under IAS 39 Before Adjustment For Classification And Measurement [Member]      
Disclosure of initial application of standards or interpretations [line items]      
Financial assets available-for-sale 2,154    
Equity instruments | Under IFRS 9 After Adjustment For Classification And Measurement [Member]      
Disclosure of initial application of standards or interpretations [line items]      
Non-trading financial assets mandatorily at fair value through profit or loss     1,651
Investments in equity instruments designated at fair value through other comprehensive income     533
Equity instruments | Increase Decrease Due To Initial Adoption Of IFRS 9 Related To Naming Modifications [Member]      
Disclosure of initial application of standards or interpretations [line items]      
Financial assets available-for-sale     (2,636)
Financial assets at fair value through profit or loss, designated upon initial recognition or subsequently     (933)
Non-trading financial assets mandatorily at fair value through profit or loss     933
Financial assets measured at fair value through other comprehensive income     2,636
Equity instruments | Increase Decrease Due To Initial Adoption Of IFRS 9 Related To Classification And Measurement [Member]      
Disclosure of initial application of standards or interpretations [line items]      
Financial assets available-for-sale     (2,154)
Non-trading financial assets mandatorily at fair value through profit or loss     1,651
Financial assets measured at fair value through other comprehensive income     533
Debt instruments      
Disclosure of initial application of standards or interpretations [line items]      
Financial assets available-for-sale 128,481    
Held-to-maturity investments 13,491    
Loans and receivables 17,543    
Financial assets held for trading 36,351 27,005 36,554
Financial assets at fair value through profit or loss, designated upon initial recognition or subsequently 3,485 2,912 3,286
Non-trading financial assets mandatorily at fair value through profit or loss   2,018 1,792
Financial assets measured at fair value through other comprehensive income   116,520 122,077
Financial assets at amortised cost   39,524 35,772
Debt instruments | Under IAS 39 Before Adjustment For Classification And Measurement [Member]      
Disclosure of initial application of standards or interpretations [line items]      
Loans and receivables to non-trading assets at FVTPL 1,537    
Loans and receivables to assets at FVTOCI 457    
Financial assets available for sale to non-trading assets at FVTPL 96    
Financial assets available for sale to assets at amortized cost 6,589    
Financial assets available for sale to assets held for trading 203    
Held-to-maturity investments 13,491    
Financial assets at fair value through profit or loss, designated upon initial recognition or subsequently 199    
Debt instruments | Under IAS 39 Before Adjustment For Impairment [Member] | Impairment losses      
Disclosure of initial application of standards or interpretations [line items]      
Financial assets at amortised cost (730)    
Debt instruments | Under IFRS 9 After Adjustment For Classification And Measurement [Member]      
Disclosure of initial application of standards or interpretations [line items]      
Financial assets held for trading     203
Non-trading financial assets mandatorily at fair value through profit or loss     199
Financial assets mandatorily at FVTPL from loans and receivables     1,497
Financial assets mandatorily at FVTPL from assets available for sale     96
Financial assets measured at fair value through other comprehensive income     486
Financial assets at amortised cost     6,704
Financial assets at amortized cost from investments held to maturity     13,491
Debt instruments | Under IFRS 9 After Adjustment For Impairment [Member] | Impairment losses      
Disclosure of initial application of standards or interpretations [line items]      
Financial assets measured at fair value through other comprehensive income     (2)
Financial assets at amortised cost     (702)
Debt instruments | Increase Decrease Due To Initial Adoption Of IFRS 9 Related To Naming Modifications [Member]      
Disclosure of initial application of standards or interpretations [line items]      
Financial assets available-for-sale     (121,593)
Loans and receivables     (15,557)
Financial assets measured at fair value through other comprehensive income     121,593
Financial assets at amortised cost     15,557
Debt instruments | Increase Decrease Due To Initial Adoption Of IFRS 9 Related To Classification And Measurement [Member]      
Disclosure of initial application of standards or interpretations [line items]      
Financial assets available-for-sale     (6,888)
Loans and receivables     (1,994)
Financial assets held for trading     203
Financial assets at fair value through profit or loss, designated upon initial recognition or subsequently     (199)
Non-trading financial assets mandatorily at fair value through profit or loss     1,792
Financial assets measured at fair value through other comprehensive income     486
Financial assets at amortised cost     20,195
Debt instruments | Increase Decrease Due To Initial Adoption Of IFRS 9 Related To Impairment [Member]      
Disclosure of initial application of standards or interpretations [line items]      
Loans and receivables     8
Financial assets measured at fair value through other comprehensive income     (2)
Financial assets at amortised cost     20
Debt instruments | Increase Decrease Due To Initial Adoption Of IFRS 9 Related To Impairment [Member] | Impairment losses      
Disclosure of initial application of standards or interpretations [line items]      
Financial assets measured at fair value through other comprehensive income     (2)
Financial assets at amortised cost     28
Loans and advances      
Disclosure of initial application of standards or interpretations [line items]      
Loans and receivables 885,470    
Financial assets held for trading 10,511 12,275 10,468
Financial assets at fair value through profit or loss, designated upon initial recognition or subsequently 30,364 45,131 38,789
Non-trading financial assets mandatorily at fair value through profit or loss   289 296
Financial assets measured at fair value through other comprehensive income   1,545 1,107
Financial assets at amortised cost   883,424 873,637
Loans and advances | Under IAS 39 Before Adjustment For Classification And Measurement [Member]      
Disclosure of initial application of standards or interpretations [line items]      
Loans and receivables to assets at FVTOCI 1,069    
Loans and receivables 9,864    
Financial assets held for trading 43    
Financial assets at fair value through profit or loss, designated upon initial recognition or subsequently 1,152    
Loans and advances | Under IAS 39 Before Adjustment For Impairment [Member] | Impairment losses      
Disclosure of initial application of standards or interpretations [line items]      
Financial assets at amortised cost (23,952)    
Loans and advances | Under IFRS 9 After Adjustment For Classification And Measurement [Member]      
Disclosure of initial application of standards or interpretations [line items]      
Financial assets at fair value through profit or loss, designated upon initial recognition or subsequently     9,577
Non-trading financial assets mandatorily at fair value through profit or loss     296
Financial assets measured at fair value through other comprehensive income     1,107
Financial assets at amortised cost     1,102
Loans and advances | Under IFRS 9 After Adjustment For Impairment [Member] | Impairment losses      
Disclosure of initial application of standards or interpretations [line items]      
Financial assets at amortised cost     (25,954)
Loans and advances | Increase Decrease Due To Initial Adoption Of IFRS 9 Related To Naming Modifications [Member]      
Disclosure of initial application of standards or interpretations [line items]      
Loans and receivables     (874,537)
Financial assets at amortised cost     874,537
Loans and advances | Increase Decrease Due To Initial Adoption Of IFRS 9 Related To Classification And Measurement [Member]      
Disclosure of initial application of standards or interpretations [line items]      
Loans and receivables     (10,933)
Financial assets held for trading     (43)
Financial assets at fair value through profit or loss, designated upon initial recognition or subsequently     8,425
Non-trading financial assets mandatorily at fair value through profit or loss     296
Financial assets measured at fair value through other comprehensive income     1,107
Financial assets at amortised cost     1,102
Loans and advances | Increase Decrease Due To Initial Adoption Of IFRS 9 Related To Impairment [Member]      
Disclosure of initial application of standards or interpretations [line items]      
Financial assets at amortised cost     (2,002)
Loans and advances | Increase Decrease Due To Initial Adoption Of IFRS 9 Related To Impairment [Member] | Impairment losses      
Disclosure of initial application of standards or interpretations [line items]      
Financial assets at amortised cost     (2,002)
Provision for commitments and guarantees given      
Disclosure of initial application of standards or interpretations [line items]      
Provisions 617 € 855 814
Provision for commitments and guarantees given | Under IAS 39 Before Adjustment For Impairment [Member] | Impairment losses      
Disclosure of initial application of standards or interpretations [line items]      
Provisions € (617)    
Provision for commitments and guarantees given | Under IFRS 9 After Adjustment For Impairment [Member] | Impairment losses      
Disclosure of initial application of standards or interpretations [line items]      
Provisions     (814)
Provision for commitments and guarantees given | Increase Decrease Due To Initial Adoption Of IFRS 9 Related To Impairment [Member]      
Disclosure of initial application of standards or interpretations [line items]      
Provisions     197
Provision for commitments and guarantees given | Increase Decrease Due To Initial Adoption Of IFRS 9 Related To Impairment [Member] | Impairment losses      
Disclosure of initial application of standards or interpretations [line items]      
Provisions     € (197)