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FVM - Fair value hierarchy - Assets (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] $ 377,668 $ 418,386 $ 362,322
Measured at fair value on a recurring basis | Financial assets at fair value held for trading      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 98,155 90,686 127,695
Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Equity instruments      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 64,949 55,680 96,788
Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Government bills / bonds      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 13,339 13,852 11,464
Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Investment fund units      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 8,053 8,654 8,867
Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Corporate and municipal bonds      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 8,732 9,549 8,093
Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Loans      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 2,580 2,325 1,971
Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Asset-backed securities      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 501 628 512
Measured at fair value on a recurring basis | Derivative financial instruments      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 152,010 212,986 121,843
Measured at fair value on a recurring basis | Derivative financial instruments | Interest rate contracts      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 55,502 55,839 42,558
Measured at fair value on a recurring basis | Derivative financial instruments | Foreign exchange contracts      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 53,797 94,731 52,476
Measured at fair value on a recurring basis | Derivative financial instruments | Equity / index contracts      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 36,991 55,294 22,825
Measured at fair value on a recurring basis | Derivative financial instruments | Credit derivative contracts      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 1,945 2,243 2,007
Measured at fair value on a recurring basis | Derivative financial instruments | Commodity contracts      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 3,304 3,915 1,821
Measured at fair value on a recurring basis | Brokerage receivables      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 19,848 20,319 18,007
Measured at fair value on a recurring basis | Financial assets at fair value not held for trading      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 94,010 82,490 83,636
Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Financial assets for unit-linked investment contracts      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 26,392 22,826 27,686
Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Equity instruments      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 606 549 559
Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Government bills / bonds      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 26,714 19,808 15,790
Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Investment fund units      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 406 378 432
Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Corporate and municipal bonds      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 21,316 20,408 19,385
Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Loans      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 9,340 9,470 11,438
Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Securities financing transactions      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 7,289 7,056 6,294
Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Auction rate securities      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 1,393 1,393 1,536
Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Other      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 553 602 515
Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 8,624 7,653 6,345
Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Government bills / bonds      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 1,612 1,705 1,875
Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Corporate and municipal bonds      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 378 441 515
Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Asset-backed securities      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 6,634 5,507 3,955
Measured at fair value on a recurring basis | Non-financial assets - Precious metals and other physical commodities      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 4,890 4,050 4,597
Measured at fair value on a non-recurring basis | Other non-financial assets      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Other non-financial assets measured at fair value [1] 130 202 199
Level 1      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 138,744 120,247 161,102
Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 82,046 73,687 113,635
Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Equity instruments      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 64,164 54,960 96,162
Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Government bills / bonds      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 11,057 11,017 9,630
Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Investment fund units      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 6,282 7,077 7,088
Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Corporate and municipal bonds      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 537 618 755
Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Loans      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 0 0 0
Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Asset-backed securities      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 7 16 0
Level 1 | Measured at fair value on a recurring basis | Derivative financial instruments      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 868 1,193 356
Level 1 | Measured at fair value on a recurring basis | Derivative financial instruments | Interest rate contracts      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 25 20 6
Level 1 | Measured at fair value on a recurring basis | Derivative financial instruments | Foreign exchange contracts      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 472 635 240
Level 1 | Measured at fair value on a recurring basis | Derivative financial instruments | Equity / index contracts      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 0 4 7
Level 1 | Measured at fair value on a recurring basis | Derivative financial instruments | Credit derivative contracts      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 0 0 0
Level 1 | Measured at fair value on a recurring basis | Derivative financial instruments | Commodity contracts      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 0 0 0
Level 1 | Measured at fair value on a recurring basis | Brokerage receivables      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 0 0 0
Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 49,389 39,666 40,608
Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Financial assets for unit-linked investment contracts      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 26,387 22,826 27,568
Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Equity instruments      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 61 93 103
Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Government bills / bonds      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 22,175 15,954 12,089
Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Investment fund units      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 188 138 194
Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Corporate and municipal bonds      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 578 655 653
Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Loans      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 0 0 0
Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Securities financing transactions      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 0 0 0
Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Auction rate securities      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 0 0 0
Level 1 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Other      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 0 0 0
Level 1 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 1,551 1,651 1,906
Level 1 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Government bills / bonds      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 1,515 1,613 1,859
Level 1 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Corporate and municipal bonds      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 36 38 47
Level 1 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Asset-backed securities      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 0 0 0
Level 1 | Measured at fair value on a recurring basis | Non-financial assets - Precious metals and other physical commodities      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 4,890 4,050 4,597
Level 1 | Measured at fair value on a non-recurring basis | Other non-financial assets      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Other non-financial assets measured at fair value [1] 0 0 0
Level 2      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 230,808 289,776 193,983
Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 13,399 14,982 12,248
Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Equity instruments      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 710 535 400
Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Government bills / bonds      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 2,272 2,826 1,770
Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Investment fund units      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 1,744 1,556 1,729
Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Corporate and municipal bonds      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 7,416 8,432 6,796
Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Loans      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 980 1,205 1,180
Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Asset-backed securities      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 277 428 372
Level 2 | Measured at fair value on a recurring basis | Derivative financial instruments      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 149,601 209,349 120,224
Level 2 | Measured at fair value on a recurring basis | Derivative financial instruments | Interest rate contracts      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 55,147 55,402 42,288
Level 2 | Measured at fair value on a recurring basis | Derivative financial instruments | Foreign exchange contracts      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 53,317 94,070 52,228
Level 2 | Measured at fair value on a recurring basis | Derivative financial instruments | Equity / index contracts      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 36,195 53,989 22,220
Level 2 | Measured at fair value on a recurring basis | Derivative financial instruments | Credit derivative contracts      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 1,540 1,574 1,612
Level 2 | Measured at fair value on a recurring basis | Derivative financial instruments | Commodity contracts      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 3,302 3,909 1,820
Level 2 | Measured at fair value on a recurring basis | Brokerage receivables      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 19,848 20,319 18,007
Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 40,886 39,125 39,065
Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Financial assets for unit-linked investment contracts      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 0 0 118
Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Equity instruments      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 0 3 4
Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Government bills / bonds      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 4,540 3,853 3,700
Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Investment fund units      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 115 132 140
Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Corporate and municipal bonds      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 20,737 19,753 18,732
Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Loans      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 8,317 8,390 10,206
Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Securities financing transactions      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 7,163 6,909 6,148
Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Auction rate securities      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 0 0 0
Level 2 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Other      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 13 84 16
Level 2 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 7,074 6,002 4,439
Level 2 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Government bills / bonds      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 98 92 16
Level 2 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Corporate and municipal bonds      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 341 404 468
Level 2 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Asset-backed securities      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 6,634 5,507 3,955
Level 2 | Measured at fair value on a recurring basis | Non-financial assets - Precious metals and other physical commodities      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 0 0 0
Level 2 | Measured at fair value on a non-recurring basis | Other non-financial assets      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Other non-financial assets measured at fair value [1] 0 0 0
Level 3      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 8,116 8,364 7,237
Level 3 | Equity instruments      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [2] 600   700
Level 3 | Investment fund units      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [2] 100   100
Level 3 | Corporate and municipal bonds      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value 800   500
Level 3 | Auction rate securities      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value 1,400   1,500
Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 2,710 2,018 1,812
Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Equity instruments      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 76 185 226
Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Government bills / bonds      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 10 9 64
Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Investment fund units      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 27 21 50
Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Corporate and municipal bonds      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 779 498 542
Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Loans      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 1,600 1,120 791
Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value held for trading | Asset-backed securities      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 218 184 140
Level 3 | Measured at fair value on a recurring basis | Derivative financial instruments      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 1,541 2,445 1,264
Level 3 | Measured at fair value on a recurring basis | Derivative financial instruments | Interest rate contracts      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 330 418 263
Level 3 | Measured at fair value on a recurring basis | Derivative financial instruments | Foreign exchange contracts      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 7 26 8
Level 3 | Measured at fair value on a recurring basis | Derivative financial instruments | Equity / index contracts      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 795 1,301 597
Level 3 | Measured at fair value on a recurring basis | Derivative financial instruments | Credit derivative contracts      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 405 669 394
Level 3 | Measured at fair value on a recurring basis | Derivative financial instruments | Commodity contracts      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 1 6 0
Level 3 | Measured at fair value on a recurring basis | Brokerage receivables      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 0 0 0
Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 3,735 3,699 3,962
Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Financial assets for unit-linked investment contracts      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 5 0 0
Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Equity instruments      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 545 454 451
Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Government bills / bonds      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 0 0 0
Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Investment fund units      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 103 107 98
Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Corporate and municipal bonds      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 0 0 0
Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Loans      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 1,024 1,081 1,231
Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Securities financing transactions      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 126 147 147
Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Auction rate securities      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 1,393 1,393 1,536
Level 3 | Measured at fair value on a recurring basis | Financial assets at fair value not held for trading | Other      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 540 518 499
Level 3 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 0 0 0
Level 3 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Government bills / bonds      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 0 0 0
Level 3 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Corporate and municipal bonds      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 0 0 0
Level 3 | Measured at fair value on a recurring basis | Financial assets measured at fair value through other comprehensive income | Asset-backed securities      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 0 0 0
Level 3 | Measured at fair value on a recurring basis | Non-financial assets - Precious metals and other physical commodities      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Financial assets measured at fair value [1] 0 0 0
Level 3 | Measured at fair value on a non-recurring basis | Other non-financial assets      
Disclosure Of Fair Value Measurement Of Assets [Line Items]      
Other non-financial assets measured at fair value [1] $ 130 $ 202 $ 199
[1]
Bifurcated embedded derivatives are presented on the same balance sheet lines as their host contracts and are not included in this table. The fair value of these derivatives was not material for the periods presented
[2]
The range of inputs is not disclosed as there is a dispersion of values given the diverse nature of the investments.