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Fair value measurement - Details of Certain Items Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Non-agency RMBS    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total available-for-sale securities $ 559 $ 638
Non-agency RMBS | 2007    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total available-for-sale securities 49 58
Non-agency RMBS | 2006    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total available-for-sale securities 88 98
Non-agency RMBS | 2005    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total available-for-sale securities 161 180
Non-agency RMBS | 2004 and earlier    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total available-for-sale securities $ 261 $ 302
Non-agency RMBS | AAA/ AA-    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 8.00% 9.00%
Non-agency RMBS | AAA/ AA- | 2005    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 22.00% 23.00%
Non-agency RMBS | AAA/ AA- | 2004 and earlier    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 4.00% 5.00%
Non-agency RMBS | A/ A-    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 2.00% 3.00%
Non-agency RMBS | A/ A- | 2005    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 3.00% 5.00%
Non-agency RMBS | A/ A- | 2004 and earlier    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 3.00% 3.00%
Non-agency RMBS | BBB/ BBB-    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 14.00% 14.00%
Non-agency RMBS | BBB/ BBB- | 2007    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings   0.00%
Non-agency RMBS | BBB/ BBB- | 2005    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 7.00% 9.00%
Non-agency RMBS | BBB/ BBB- | 2004 and earlier    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 26.00% 24.00%
Non-agency RMBS | BB and lower    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 76.00% 74.00%
Non-agency RMBS | BB and lower | 2007    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 100.00% 100.00%
Non-agency RMBS | BB and lower | 2006    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 100.00% 100.00%
Non-agency RMBS | BB and lower | 2005    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 68.00% 63.00%
Non-agency RMBS | BB and lower | 2004 and earlier    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 67.00% 68.00%
Commercial MBS | Total Domestic    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total available-for-sale securities $ 768 $ 881
Commercial MBS | 2007 | Total Domestic    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total available-for-sale securities 24 190
Commercial MBS | 2006 | Total Domestic    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total available-for-sale securities 0 3
Commercial MBS | 2009-2017 | Total Domestic    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total available-for-sale securities 733 674
Commercial MBS | 2008 | Total Domestic    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total available-for-sale securities $ 11 $ 14
Commercial MBS | AAA/ AA- | Total Domestic    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 87.00% 81.00%
Commercial MBS | AAA/ AA- | 2007 | Total Domestic    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 100.00% 71.00%
Commercial MBS | AAA/ AA- | 2006 | Total Domestic    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 0.00% 7.00%
Commercial MBS | AAA/ AA- | 2009-2017 | Total Domestic    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 87.00% 84.00%
Commercial MBS | AAA/ AA- | 2008 | Total Domestic    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 100.00% 100.00%
Commercial MBS | A/ A- | Total Domestic    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 13.00% 19.00%
Commercial MBS | A/ A- | 2007 | Total Domestic    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 0.00% 29.00%
Commercial MBS | A/ A- | 2006 | Total Domestic    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 0.00% 93.00%
Commercial MBS | A/ A- | 2009-2017 | Total Domestic    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 13.00% 16.00%
Commercial MBS | A/ A- | 2008 | Total Domestic    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings   0.00%
Commercial MBS | BBB/ BBB- | Total Domestic    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 0.00% 0.00%
Commercial MBS | BBB/ BBB- | 2007 | Total Domestic    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 0.00% 0.00%
Commercial MBS | BB and lower | 2006 | Total Domestic    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 0.00%  
Foreign covered bonds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total available-for-sale securities $ 2,390 $ 2,141
Foreign covered bonds | Canada    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total available-for-sale securities 1,556 1,320
Foreign covered bonds | Netherlands    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total available-for-sale securities 172 160
Foreign covered bonds | United Kingdom    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total available-for-sale securities 131 280
Foreign covered bonds | Other    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total available-for-sale securities $ 531 $ 381
Foreign covered bonds | AAA/ AA-    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 100.00% 100.00%
Foreign covered bonds | AAA/ AA- | Canada    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 100.00% 100.00%
Foreign covered bonds | AAA/ AA- | Netherlands    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 100.00% 100.00%
Foreign covered bonds | AAA/ AA- | United Kingdom    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 100.00% 100.00%
Foreign covered bonds | AAA/ AA- | Other    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 100.00% 100.00%
Total European floating rate notes - available-for-sale | Securities available-for-sale    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total available-for-sale securities $ 380 $ 562
Total European floating rate notes - available-for-sale | Securities available-for-sale | Netherlands    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total available-for-sale securities 81 125
Total European floating rate notes - available-for-sale | Securities available-for-sale | United Kingdom    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total available-for-sale securities 299 379
Total European floating rate notes - available-for-sale | Securities available-for-sale | Ireland    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total available-for-sale securities $ 0 $ 58
Total European floating rate notes - available-for-sale | AAA/ AA- | Securities available-for-sale    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 90.00% 83.00%
Total European floating rate notes - available-for-sale | AAA/ AA- | Securities available-for-sale | Netherlands    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 100.00% 100.00%
Total European floating rate notes - available-for-sale | AAA/ AA- | Securities available-for-sale | United Kingdom    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 88.00% 90.00%
Total European floating rate notes - available-for-sale | AAA/ AA- | Securities available-for-sale | Ireland    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 0.00% 0.00%
Total European floating rate notes - available-for-sale | A/ A- | Securities available-for-sale    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 10.00% 7.00%
Total European floating rate notes - available-for-sale | A/ A- | Securities available-for-sale | United Kingdom    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 12.00% 10.00%
Total European floating rate notes - available-for-sale | A/ A- | Securities available-for-sale | Ireland    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 0.00% 0.00%
Total European floating rate notes - available-for-sale | BBB/ BBB- | Securities available-for-sale    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 0.00% 10.00%
Total European floating rate notes - available-for-sale | BBB/ BBB- | Securities available-for-sale | Ireland    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 0.00% 100.00%
Total European floating rate notes - available-for-sale | BB and lower | Securities available-for-sale    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 0.00% 0.00%
Total European floating rate notes - available-for-sale | BB and lower | Securities available-for-sale | Ireland    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 0.00% 0.00%
Sovereign debt/sovereign guaranteed    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total available-for-sale securities $ 12,288 $ 12,489
Sovereign debt/sovereign guaranteed | Netherlands    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total available-for-sale securities 981 1,061
Sovereign debt/sovereign guaranteed | United Kingdom    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total available-for-sale securities 2,853 3,209
Sovereign debt/sovereign guaranteed | France    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total available-for-sale securities 2,378 1,998
Sovereign debt/sovereign guaranteed | Spain    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total available-for-sale securities 1,656 1,749
Sovereign debt/sovereign guaranteed | Germany    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total available-for-sale securities 1,542 1,347
Sovereign debt/sovereign guaranteed | Italy    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total available-for-sale securities 1,018 1,130
Sovereign debt/sovereign guaranteed | Ireland    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total available-for-sale securities 807 736
Sovereign debt/sovereign guaranteed | Belgium    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total available-for-sale securities 785 1,005
Sovereign debt/sovereign guaranteed | Other    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total available-for-sale securities 268 254
Sovereign debt/sovereign guaranteed | Brazil    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total available-for-sale securities $ 136 $ 73
Sovereign debt/sovereign guaranteed | AAA/ AA-    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 70.00% 70.00%
Sovereign debt/sovereign guaranteed | AAA/ AA- | Netherlands    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 100.00% 100.00%
Sovereign debt/sovereign guaranteed | AAA/ AA- | United Kingdom    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 100.00% 100.00%
Sovereign debt/sovereign guaranteed | AAA/ AA- | France    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 100.00% 100.00%
Sovereign debt/sovereign guaranteed | AAA/ AA- | Germany    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 100.00% 100.00%
Sovereign debt/sovereign guaranteed | AAA/ AA- | Italy    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings   0.00%
Sovereign debt/sovereign guaranteed | AAA/ AA- | Belgium    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 100.00% 100.00%
Sovereign debt/sovereign guaranteed | AAA/ AA- | Other    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 49.00% 71.00%
Sovereign debt/sovereign guaranteed | A/ A-    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 7.00% 6.00%
Sovereign debt/sovereign guaranteed | A/ A- | Ireland    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 100.00% 100.00%
Sovereign debt/sovereign guaranteed | BBB/ BBB-    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 22.00% 23.00%
Sovereign debt/sovereign guaranteed | BBB/ BBB- | Spain    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 100.00% 100.00%
Sovereign debt/sovereign guaranteed | BBB/ BBB- | Germany    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings   0.00%
Sovereign debt/sovereign guaranteed | BBB/ BBB- | Italy    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 100.00% 100.00%
Sovereign debt/sovereign guaranteed | BBB/ BBB- | Ireland    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 0.00% 0.00%
Sovereign debt/sovereign guaranteed | BBB/ BBB- | Other    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 0.00% 0.00%
Sovereign debt/sovereign guaranteed | BB and lower    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 1.00% 1.00%
Sovereign debt/sovereign guaranteed | BB and lower | Other    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 51.00% 29.00%
Non-agency RMBS    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total available-for-sale securities $ 1,239 $ 1,357
Non-agency RMBS | 2007    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total available-for-sale securities 354 387
Non-agency RMBS | 2006    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total available-for-sale securities 360 391
Non-agency RMBS | 2005    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total available-for-sale securities 400 437
Non-agency RMBS | 2004 and earlier    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total available-for-sale securities $ 125 $ 142
Non-agency RMBS | AAA/ AA-    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 0.00% 0.00%
Non-agency RMBS | AAA/ AA- | 2005    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 1.00%  
Non-agency RMBS | AAA/ AA- | 2004 and earlier    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 2.00% 2.00%
Non-agency RMBS | A/ A-    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 1.00% 1.00%
Non-agency RMBS | A/ A- | 2006    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 0.00% 0.00%
Non-agency RMBS | A/ A- | 2005    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 1.00% 2.00%
Non-agency RMBS | A/ A- | 2004 and earlier    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 2.00% 2.00%
Non-agency RMBS | BBB/ BBB-    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 3.00% 2.00%
Non-agency RMBS | BBB/ BBB- | 2006    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 0.00% 0.00%
Non-agency RMBS | BBB/ BBB- | 2005    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 1.00% 1.00%
Non-agency RMBS | BBB/ BBB- | 2004 and earlier    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 24.00% 17.00%
Non-agency RMBS | BB and lower    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 96.00% 97.00%
Non-agency RMBS | BB and lower | 2007    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 100.00% 100.00%
Non-agency RMBS | BB and lower | 2006    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 100.00% 100.00%
Non-agency RMBS | BB and lower | 2005    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 97.00% 97.00%
Non-agency RMBS | BB and lower | 2004 and earlier    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Ratings 72.00% 79.00%