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CECL (Details 10) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year SFr 41,447 SFr 49,483  
Origination in current year-1 22,969 47,577  
Origination in current year-2 31,960 24,985  
Origination in current year-3 19,047 17,950  
Origination in current year-4 14,462 11,207  
Origination in current year-5 or more 44,404 43,642  
Total term loans 174,289 194,844  
Revolving loans 40,457 63,385  
Financing Receivable, before Allowance for Credit Loss and Fee 215,997 262,179  
Gross write-offs SFr (600) (181) SFr (297)
Date when internal ratings were last updated 2012    
Origination In Current Year      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs SFr (51)    
Origination In Current Year -1      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (17)    
Origination In Current Year -2      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (27)    
Origination In Current Year -3      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (12)    
Origination In Current Year -4      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (6)    
Origination In Current Year -5 or more      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (45)    
Total term positions      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (158)    
Revolving positions      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (442)    
Investment grade | AAA to BBB      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 28,170 31,284  
Origination in current year-1 16,629 37,658  
Origination in current year-2 26,116 19,524  
Origination in current year-3 15,656 13,408  
Origination in current year-4 11,239 8,667  
Origination in current year-5 or more 39,828 38,301  
Total term loans 137,638 148,842  
Revolving loans 33,140 51,661  
Financing Receivable, before Allowance for Credit Loss and Fee 172,029 204,423  
Non-investment grade | BB to C      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 12,753 17,825  
Origination in current year-1 6,079 9,647  
Origination in current year-2 5,491 5,245  
Origination in current year-3 3,155 4,261  
Origination in current year-4 3,029 2,326  
Origination in current year-5 or more 4,139 4,857  
Total term loans 34,646 44,161  
Revolving loans 6,590 10,875  
Financing Receivable, before Allowance for Credit Loss and Fee 41,236 55,066  
Non-investment grade | D      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 524 374  
Origination in current year-1 261 272  
Origination in current year-2 353 216  
Origination in current year-3 236 281  
Origination in current year-4 194 214  
Origination in current year-5 or more 437 484  
Total term loans 2,005 1,841  
Revolving loans 727 849  
Financing Receivable, before Allowance for Credit Loss and Fee 2,732 2,690  
Corporate and institutional      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 25,992 31,172  
Origination in current year-1 10,315 21,633  
Origination in current year-2 11,551 9,436  
Origination in current year-3 6,717 6,084  
Origination in current year-4 3,873 3,743  
Origination in current year-5 or more 7,182 5,847  
Total term loans 65,630 77,915  
Revolving loans 16,539 29,506  
Financing Receivable, before Allowance for Credit Loss and Fee 82,169 107,421  
Gross write-offs (542) (116) (242)
Corporate and institutional | Origination In Current Year      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (50)    
Corporate and institutional | Origination In Current Year -1      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (11)    
Corporate and institutional | Origination In Current Year -2      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (22)    
Corporate and institutional | Origination In Current Year -3      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (7)    
Corporate and institutional | Origination In Current Year -4      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (1)    
Corporate and institutional | Origination In Current Year -5 or more      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (10)    
Corporate and institutional | Total term positions      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (101)    
Corporate and institutional | Revolving positions      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (441)    
Corporate and institutional | Investment grade | AAA to BBB      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 14,664 16,086  
Origination in current year-1 5,691 13,885  
Origination in current year-2 7,283 6,041  
Origination in current year-3 4,441 3,224  
Origination in current year-4 2,109 2,016  
Origination in current year-5 or more 4,785 2,959  
Total term loans 38,973 44,211  
Revolving loans 11,508 21,091  
Financing Receivable, before Allowance for Credit Loss and Fee 50,481 65,302  
Corporate and institutional | Non-investment grade | BB to C      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 10,826 14,728  
Origination in current year-1 4,414 7,536  
Origination in current year-2 4,010 3,213  
Origination in current year-3 2,142 2,664  
Origination in current year-4 1,675 1,564  
Origination in current year-5 or more 2,180 2,658  
Total term loans 25,247 32,363  
Revolving loans 4,649 7,902  
Financing Receivable, before Allowance for Credit Loss and Fee 29,896 40,265  
Corporate and institutional | Non-investment grade | D      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 502 358  
Origination in current year-1 210 212  
Origination in current year-2 258 182  
Origination in current year-3 134 196  
Origination in current year-4 89 163  
Origination in current year-5 or more 217 230  
Total term loans 1,410 1,341  
Revolving loans 382 513  
Financing Receivable, before Allowance for Credit Loss and Fee 1,792 1,854  
Corporate and institutional | Real estate      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 4,605 6,105  
Origination in current year-1 3,062 9,442  
Origination in current year-2 5,878 3,930  
Origination in current year-3 3,137 1,312  
Origination in current year-4 1,079 918  
Origination in current year-5 or more 2,625 2,350  
Total term loans 20,386 24,057  
Revolving loans 715 1,100  
Financing Receivable, before Allowance for Credit Loss and Fee 21,101 25,157  
Gross write-offs (24)    
Corporate and institutional | Real estate | Origination In Current Year      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (24)    
Corporate and institutional | Real estate | Origination In Current Year -1      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs 0    
Corporate and institutional | Real estate | Origination In Current Year -2      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs 0    
Corporate and institutional | Real estate | Origination In Current Year -3      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs 0    
Corporate and institutional | Real estate | Origination In Current Year -4      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs 0    
Corporate and institutional | Real estate | Origination In Current Year -5 or more      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs 0    
Corporate and institutional | Real estate | Total term positions      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (24)    
Corporate and institutional | Real estate | Revolving positions      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs 0    
Corporate and institutional | Real estate | Investment grade | AAA to BBB      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 2,663 3,601  
Origination in current year-1 1,926 7,001  
Origination in current year-2 4,431 3,071  
Origination in current year-3 2,402 959  
Origination in current year-4 818 698  
Origination in current year-5 or more 2,298 2,109  
Total term loans 14,538 17,439  
Revolving loans 300 694  
Financing Receivable, before Allowance for Credit Loss and Fee 14,838 18,133  
Corporate and institutional | Real estate | Non-investment grade | BB to C      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 1,907 2,499  
Origination in current year-1 1,007 2,441  
Origination in current year-2 1,283 855  
Origination in current year-3 725 297  
Origination in current year-4 230 219  
Origination in current year-5 or more 304 217  
Total term loans 5,456 6,528  
Revolving loans 279 281  
Financing Receivable, before Allowance for Credit Loss and Fee 5,735 6,809  
Corporate and institutional | Real estate | Non-investment grade | D      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 35 5  
Origination in current year-1 129 0  
Origination in current year-2 164 4  
Origination in current year-3 10 56  
Origination in current year-4 31 1  
Origination in current year-5 or more 23 24  
Total term loans 392 90  
Revolving loans 136 125  
Financing Receivable, before Allowance for Credit Loss and Fee 528 215  
Corporate and institutional | Commercial and industrial loans      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 15,147 19,302  
Origination in current year-1 5,953 7,992  
Origination in current year-2 4,609 4,239  
Origination in current year-3 2,743 4,055  
Origination in current year-4 2,456 2,246  
Origination in current year-5 or more 3,744 4,178  
Total term loans 34,652 42,012  
Revolving loans 11,867 17,354  
Financing Receivable, before Allowance for Credit Loss and Fee 46,519 59,366  
Gross write-offs (194)    
Corporate and institutional | Commercial and industrial loans | Origination In Current Year      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (26)    
Corporate and institutional | Commercial and industrial loans | Origination In Current Year -1      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (11)    
Corporate and institutional | Commercial and industrial loans | Origination In Current Year -2      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (22)    
Corporate and institutional | Commercial and industrial loans | Origination In Current Year -3      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (7)    
Corporate and institutional | Commercial and industrial loans | Origination In Current Year -4      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (1)    
Corporate and institutional | Commercial and industrial loans | Origination In Current Year -5 or more      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (10)    
Corporate and institutional | Commercial and industrial loans | Total term positions      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (77)    
Corporate and institutional | Commercial and industrial loans | Revolving positions      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (117)    
Corporate and institutional | Commercial and industrial loans | Investment grade | AAA to BBB      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 6,599 7,858  
Origination in current year-1 2,635 3,576  
Origination in current year-2 2,121 1,810  
Origination in current year-3 1,360 1,566  
Origination in current year-4 959 742  
Origination in current year-5 or more 1,714 1,619  
Total term loans 15,388 17,171  
Revolving loans 7,607 10,277  
Financing Receivable, before Allowance for Credit Loss and Fee 22,995 27,448  
Corporate and institutional | Commercial and industrial loans | Non-investment grade | BB to C      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 8,126 11,181  
Origination in current year-1 3,237 4,204  
Origination in current year-2 2,394 2,251  
Origination in current year-3 1,259 2,359  
Origination in current year-4 1,440 1,343  
Origination in current year-5 or more 1,838 2,355  
Total term loans 18,294 23,693  
Revolving loans 4,015 6,799  
Financing Receivable, before Allowance for Credit Loss and Fee 22,309 30,492  
Corporate and institutional | Commercial and industrial loans | Non-investment grade | D      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 422 263  
Origination in current year-1 81 212  
Origination in current year-2 94 178  
Origination in current year-3 124 130  
Origination in current year-4 57 161  
Origination in current year-5 or more 192 204  
Total term loans 970 1,148  
Revolving loans 245 278  
Financing Receivable, before Allowance for Credit Loss and Fee 1,215 1,426  
Corporate and institutional | Financial institutions      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 6,092 5,596  
Origination in current year-1 925 3,706  
Origination in current year-2 963 1,101  
Origination in current year-3 688 609  
Origination in current year-4 243 524  
Origination in current year-5 or more 664 868  
Total term loans 9,575 10,668  
Revolving loans 3,944 11,043  
Financing Receivable, before Allowance for Credit Loss and Fee 13,519 21,711  
Gross write-offs (324)    
Corporate and institutional | Financial institutions | Origination In Current Year      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs 0    
Corporate and institutional | Financial institutions | Origination In Current Year -1      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs 0    
Corporate and institutional | Financial institutions | Origination In Current Year -2      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs 0    
Corporate and institutional | Financial institutions | Origination In Current Year -3      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs 0    
Corporate and institutional | Financial institutions | Origination In Current Year -4      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs 0    
Corporate and institutional | Financial institutions | Origination In Current Year -5 or more      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs 0    
Corporate and institutional | Financial institutions | Total term positions      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs 0    
Corporate and institutional | Financial institutions | Revolving positions      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (324)    
Corporate and institutional | Financial institutions | Investment grade | AAA to BBB      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 5,281 4,480  
Origination in current year-1 759 2,850  
Origination in current year-2 656 1,034  
Origination in current year-3 556 602  
Origination in current year-4 239 521  
Origination in current year-5 or more 632 940  
Total term loans 8,123 8,547  
Revolving loans 3,592 10,111  
Financing Receivable, before Allowance for Credit Loss and Fee 11,715 18,658  
Corporate and institutional | Financial institutions | Non-investment grade | BB to C      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 770 1,026  
Origination in current year-1 166 856  
Origination in current year-2 307 67  
Origination in current year-3 132 7  
Origination in current year-4 4 2  
Origination in current year-5 or more 31 71  
Total term loans 1,410 2,029  
Revolving loans 351 822  
Financing Receivable, before Allowance for Credit Loss and Fee 1,761 2,851  
Corporate and institutional | Financial institutions | Non-investment grade | D      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 41 90  
Origination in current year-1 0 0  
Origination in current year-2 0 0  
Origination in current year-3 0 0  
Origination in current year-4 0 1  
Origination in current year-5 or more 1 1  
Total term loans 42 92  
Revolving loans 1 110  
Financing Receivable, before Allowance for Credit Loss and Fee 43 202  
Corporate and institutional | Governments and public institutions      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 148 169  
Origination in current year-1 375 493  
Origination in current year-2 101 166  
Origination in current year-3 149 108  
Origination in current year-4 95 55  
Origination in current year-5 or more 149 187  
Total term loans 1,017 1,178  
Revolving loans 13 9  
Financing Receivable, before Allowance for Credit Loss and Fee 1,030 1,187  
Gross write-offs 0    
Corporate and institutional | Governments and public institutions | Origination In Current Year      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs 0    
Corporate and institutional | Governments and public institutions | Origination In Current Year -1      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs 0    
Corporate and institutional | Governments and public institutions | Origination In Current Year -2      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs 0    
Corporate and institutional | Governments and public institutions | Origination In Current Year -3      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs 0    
Corporate and institutional | Governments and public institutions | Origination In Current Year -4      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs 0    
Corporate and institutional | Governments and public institutions | Origination In Current Year -5 or more      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs 0    
Corporate and institutional | Governments and public institutions | Total term positions      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs 0    
Corporate and institutional | Governments and public institutions | Revolving positions      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs 0    
Corporate and institutional | Governments and public institutions | Investment grade | AAA to BBB      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 121 147  
Origination in current year-1 371 458  
Origination in current year-2 75 126  
Origination in current year-3 123 97  
Origination in current year-4 93 55  
Origination in current year-5 or more 141 171  
Total term loans 924 1,054  
Revolving loans 9 9  
Financing Receivable, before Allowance for Credit Loss and Fee 933 1,063  
Corporate and institutional | Governments and public institutions | Non-investment grade | BB to C      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 23 22  
Origination in current year-1 4 35  
Origination in current year-2 26 40  
Origination in current year-3 26 1  
Origination in current year-4 1 0  
Origination in current year-5 or more 7 15  
Total term loans 87 113  
Revolving loans 4 0  
Financing Receivable, before Allowance for Credit Loss and Fee 91 113  
Corporate and institutional | Governments and public institutions | Non-investment grade | D      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 4 0  
Origination in current year-1 0 0  
Origination in current year-2 0 0  
Origination in current year-3 0 10  
Origination in current year-4 1 0  
Origination in current year-5 or more 1 1  
Total term loans 6 11  
Revolving loans 0 0  
Financing Receivable, before Allowance for Credit Loss and Fee 6 11  
Consumer      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 15,455 18,311  
Origination in current year-1 12,654 25,944  
Origination in current year-2 20,409 15,549  
Origination in current year-3 12,330 11,866  
Origination in current year-4 10,589 7,464  
Origination in current year-5 or more 37,222 37,795  
Total term loans 108,659 116,929  
Revolving loans 23,918 33,879  
Financing Receivable, before Allowance for Credit Loss and Fee 132,577 150,808  
Gross write-offs (58) (65) SFr (55)
Consumer | Origination In Current Year      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (1)    
Consumer | Origination In Current Year -1      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (6)    
Consumer | Origination In Current Year -2      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (5)    
Consumer | Origination In Current Year -3      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (5)    
Consumer | Origination In Current Year -4      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (5)    
Consumer | Origination In Current Year -5 or more      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (35)    
Consumer | Total term positions      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (57)    
Consumer | Revolving positions      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (1)    
Consumer | Investment grade | AAA to BBB      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 13,506 15,198  
Origination in current year-1 10,938 23,773  
Origination in current year-2 18,833 13,483  
Origination in current year-3 11,215 10,184  
Origination in current year-4 9,130 6,651  
Origination in current year-5 or more 35,043 35,342  
Total term loans 98,665 104,631  
Revolving loans 21,632 30,570  
Financing Receivable, before Allowance for Credit Loss and Fee 120,297 135,201  
Consumer | Non-investment grade | BB to C      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 1,927 3,097  
Origination in current year-1 1,665 2,111  
Origination in current year-2 1,481 2,032  
Origination in current year-3 1,013 1,597  
Origination in current year-4 1,354 762  
Origination in current year-5 or more 1,959 2,199  
Total term loans 9,399 11,798  
Revolving loans 1,941 2,973  
Financing Receivable, before Allowance for Credit Loss and Fee 11,340 14,771  
Consumer | Non-investment grade | D      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 22 16  
Origination in current year-1 51 60  
Origination in current year-2 95 34  
Origination in current year-3 102 85  
Origination in current year-4 105 51  
Origination in current year-5 or more 220 254  
Total term loans 595 500  
Revolving loans 345 336  
Financing Receivable, before Allowance for Credit Loss and Fee 940 836  
Consumer | Mortgages      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 11,645 14,049  
Origination in current year-1 11,404 23,068  
Origination in current year-2 18,316 13,999  
Origination in current year-3 11,930 11,367  
Origination in current year-4 10,346 7,295  
Origination in current year-5 or more 36,170 36,666  
Total term loans 99,811 106,444  
Revolving loans 795 1,040  
Financing Receivable, before Allowance for Credit Loss and Fee 100,606 107,484  
Gross write-offs (9)    
Consumer | Mortgages | Origination In Current Year      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs 0    
Consumer | Mortgages | Origination In Current Year -1      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs 0    
Consumer | Mortgages | Origination In Current Year -2      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs 0    
Consumer | Mortgages | Origination In Current Year -3      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs 0    
Consumer | Mortgages | Origination In Current Year -4      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs 0    
Consumer | Mortgages | Origination In Current Year -5 or more      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (9)    
Consumer | Mortgages | Total term positions      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (9)    
Consumer | Mortgages | Revolving positions      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs 0    
Consumer | Mortgages | Investment grade | AAA to BBB      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 10,953 12,501  
Origination in current year-1 10,154 21,627  
Origination in current year-2 17,263 12,869  
Origination in current year-3 11,009 10,029  
Origination in current year-4 9,096 6,609  
Origination in current year-5 or more 34,366 34,525  
Total term loans 92,841 98,160  
Revolving loans 635 229  
Financing Receivable, before Allowance for Credit Loss and Fee 93,476 98,389  
Consumer | Mortgages | Non-investment grade | BB to C      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 687 1,540  
Origination in current year-1 1,220 1,396  
Origination in current year-2 977 1,111  
Origination in current year-3 835 1,271  
Origination in current year-4 1,161 650  
Origination in current year-5 or more 1,632 1,931  
Total term loans 6,512 7,899  
Revolving loans 160 807  
Financing Receivable, before Allowance for Credit Loss and Fee 6,672 8,706  
Consumer | Mortgages | Non-investment grade | D      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 5 8  
Origination in current year-1 30 45  
Origination in current year-2 76 19  
Origination in current year-3 86 67  
Origination in current year-4 89 36  
Origination in current year-5 or more 172 210  
Total term loans 458 385  
Revolving loans 0 4  
Financing Receivable, before Allowance for Credit Loss and Fee 458 389  
Consumer | Loans collateralized by securities      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 802 1,114  
Origination in current year-1 115 1,877  
Origination in current year-2 1,450 1,028  
Origination in current year-3 87 178  
Origination in current year-4 97 41  
Origination in current year-5 or more 894 991  
Total term loans 3,445 5,229  
Revolving loans 22,935 32,410  
Financing Receivable, before Allowance for Credit Loss and Fee 26,380 37,639  
Gross write-offs 0    
Consumer | Loans collateralized by securities | Origination In Current Year      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs 0    
Consumer | Loans collateralized by securities | Origination In Current Year -1      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs 0    
Consumer | Loans collateralized by securities | Origination In Current Year -2      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs 0    
Consumer | Loans collateralized by securities | Origination In Current Year -3      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs 0    
Consumer | Loans collateralized by securities | Origination In Current Year -4      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs 0    
Consumer | Loans collateralized by securities | Origination In Current Year -5 or more      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs 0    
Consumer | Loans collateralized by securities | Total term positions      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs 0    
Consumer | Loans collateralized by securities | Revolving positions      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs 0    
Consumer | Loans collateralized by securities | Investment grade | AAA to BBB      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 404 562  
Origination in current year-1 98 1,496  
Origination in current year-2 1,197 307  
Origination in current year-3 87 35  
Origination in current year-4 0 16  
Origination in current year-5 or more 658 803  
Total term loans 2,444 3,219  
Revolving loans 20,928 30,023  
Financing Receivable, before Allowance for Credit Loss and Fee 23,372 33,242  
Consumer | Loans collateralized by securities | Non-investment grade | BB to C      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 398 552  
Origination in current year-1 17 381  
Origination in current year-2 253 721  
Origination in current year-3 0 143  
Origination in current year-4 97 25  
Origination in current year-5 or more 236 188  
Total term loans 1,001 2,010  
Revolving loans 1,731 2,124  
Financing Receivable, before Allowance for Credit Loss and Fee 2,732 4,134  
Consumer | Loans collateralized by securities | Non-investment grade | D      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 0 0  
Origination in current year-1 0 0  
Origination in current year-2 0 0  
Origination in current year-3 0 0  
Origination in current year-4 0 0  
Origination in current year-5 or more 0 0  
Total term loans 0 0  
Revolving loans 276 263  
Financing Receivable, before Allowance for Credit Loss and Fee 276 263  
Consumer | Consumer finance      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 3,008 3,148  
Origination in current year-1 1,135 999  
Origination in current year-2 643 522  
Origination in current year-3 313 321  
Origination in current year-4 146 128  
Origination in current year-5 or more 158 138  
Total term loans 5,403 5,256  
Revolving loans 188 429  
Financing Receivable, before Allowance for Credit Loss and Fee 5,591 5,685  
Gross write-offs (49)    
Consumer | Consumer finance | Origination In Current Year      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (1)    
Consumer | Consumer finance | Origination In Current Year -1      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (6)    
Consumer | Consumer finance | Origination In Current Year -2      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (5)    
Consumer | Consumer finance | Origination In Current Year -3      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (5)    
Consumer | Consumer finance | Origination In Current Year -4      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (5)    
Consumer | Consumer finance | Origination In Current Year -5 or more      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (26)    
Consumer | Consumer finance | Total term positions      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (48)    
Consumer | Consumer finance | Revolving positions      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Gross write-offs (1)    
Consumer | Consumer finance | Investment grade | AAA to BBB      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 2,149 2,135  
Origination in current year-1 686 650  
Origination in current year-2 373 307  
Origination in current year-3 119 120  
Origination in current year-4 34 26  
Origination in current year-5 or more 19 14  
Total term loans 3,380 3,252  
Revolving loans 69 318  
Financing Receivable, before Allowance for Credit Loss and Fee 3,449 3,570  
Consumer | Consumer finance | Non-investment grade | BB to C      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 842 1,005  
Origination in current year-1 428 334  
Origination in current year-2 251 200  
Origination in current year-3 178 183  
Origination in current year-4 96 87  
Origination in current year-5 or more 91 80  
Total term loans 1,886 1,889  
Revolving loans 50 42  
Financing Receivable, before Allowance for Credit Loss and Fee 1,936 1,931  
Consumer | Consumer finance | Non-investment grade | D      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Origination in current year 17 8  
Origination in current year-1 21 15  
Origination in current year-2 19 15  
Origination in current year-3 16 18  
Origination in current year-4 16 15  
Origination in current year-5 or more 48 44  
Total term loans 137 115  
Revolving loans 69 69  
Financing Receivable, before Allowance for Credit Loss and Fee 206 184  
Total loans to third parties      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Financing Receivable, before Allowance for Credit Loss and Fee 214,746 258,229  
Gross write-offs (600)    
Total loans to third parties | Investment grade | AAA to BBB      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Financing Receivable, before Allowance for Credit Loss and Fee 170,778 200,503  
Total loans to third parties | Non-investment grade | BB to C      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Financing Receivable, before Allowance for Credit Loss and Fee 41,236 55,036  
Total loans to third parties | Non-investment grade | D      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Financing Receivable, before Allowance for Credit Loss and Fee 2,732 2,690  
Total loans to entities under common control      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Financing Receivable, before Allowance for Credit Loss and Fee 1,251 3,950  
Gross write-offs 0    
Total loans to entities under common control | Investment grade | AAA to BBB      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Financing Receivable, before Allowance for Credit Loss and Fee 1,251 3,920  
Total loans to entities under common control | Non-investment grade | BB to C      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Financing Receivable, before Allowance for Credit Loss and Fee 0 30  
Total loans to entities under common control | Non-investment grade | D      
Loans Held At Amortized Cost, Amortized Cost [Line Items]      
Financing Receivable, before Allowance for Credit Loss and Fee SFr 0 SFr 0