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Fair Value Measurements - Carrying Value and Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Fair Value Of Other Financial Instrument [Line Items]      
Federal funds sold and securities purchased under agreements to resell $ 9,814 $ 32,618  
Securities held-to-maturity 14,274 13,977  
Loans, net of allowance for credit losses 66,739 [1] 71,882 $ 68,667
Loans held for sale 470 715  
Deposits 117,953 [1] 118,702 $ 129,258
Deposits held for sale 291 673  
Long-term debt 32,008 34,966  
Commercial Loans [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans held for sale 406 648  
Consumer Loans [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans held for sale 64 67  
Consumer Loans [Member] | Residential Mortgage [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans held for sale 6 6  
Consumer Loans [Member] | Other consumer [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans held for sale 58 61  
Level 1 [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Short-term financial assets 1,053 1,115  
Federal funds sold and securities purchased under agreements to resell 0 0  
Securities held-to-maturity 0 0  
Short-term financial liabilities 0 0  
Deposits held for sale 0 0  
Long-term debt 0 0  
Level 1 [Member] | Commercial Loans [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans, net of allowance for credit losses 0 0  
Loans held for sale 0 0  
Level 1 [Member] | Consumer Loans [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans, net of allowance for credit losses 0 0  
Level 1 [Member] | Consumer Loans [Member] | Residential Mortgage [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans held for sale 0 0  
Level 1 [Member] | Consumer Loans [Member] | Other consumer [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans held for sale 0 0  
Level 1 [Member] | Deposits Without Fixed Maturities [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Deposits 0 0  
Level 1 [Member] | Deposits With Fixed Maturities [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Deposits 0 0  
Level 2 [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Short-term financial assets 17,895 11,157  
Federal funds sold and securities purchased under agreements to resell 9,472 32,538  
Securities held-to-maturity 14,005 13,902  
Short-term financial liabilities 3,311 2,635  
Deposits held for sale 291 673  
Long-term debt 19,828 22,717  
Level 2 [Member] | Commercial Loans [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans, net of allowance for credit losses 0 0  
Loans held for sale 68 177  
Level 2 [Member] | Consumer Loans [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans, net of allowance for credit losses 0 0  
Level 2 [Member] | Consumer Loans [Member] | Residential Mortgage [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans held for sale 4 5  
Level 2 [Member] | Consumer Loans [Member] | Other consumer [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans held for sale 0 0  
Level 2 [Member] | Deposits Without Fixed Maturities [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Deposits 99,148 100,502  
Level 2 [Member] | Deposits With Fixed Maturities [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Deposits 10,636 9,782  
Level 3 [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Short-term financial assets 16 32  
Federal funds sold and securities purchased under agreements to resell 0 0  
Securities held-to-maturity 0 0  
Short-term financial liabilities 16 32  
Deposits held for sale 0 0  
Long-term debt 0 0  
Level 3 [Member] | Commercial Loans [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans, net of allowance for credit losses 48,946 54,210  
Loans held for sale 0 0  
Level 3 [Member] | Consumer Loans [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans, net of allowance for credit losses 18,702 18,598  
Level 3 [Member] | Consumer Loans [Member] | Residential Mortgage [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans held for sale 2 1  
Level 3 [Member] | Consumer Loans [Member] | Other consumer [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans held for sale 58 61  
Level 3 [Member] | Deposits Without Fixed Maturities [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Deposits 0 0  
Level 3 [Member] | Deposits With Fixed Maturities [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Deposits 0 0  
Carrying Value [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Short-term financial assets 18,964 12,304  
Federal funds sold and securities purchased under agreements to resell 9,472 32,538  
Securities held-to-maturity 14,274 13,977  
Short-term financial liabilities 3,321 2,650  
Deposits held for sale 291 673  
Long-term debt 19,272 22,080  
Carrying Value [Member] | Commercial Loans [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans, net of allowance for credit losses 47,210 52,427  
Loans held for sale 68 177  
Carrying Value [Member] | Consumer Loans [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans, net of allowance for credit losses 19,529 19,455  
Carrying Value [Member] | Consumer Loans [Member] | Residential Mortgage [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans held for sale 6 6  
Carrying Value [Member] | Consumer Loans [Member] | Other consumer [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans held for sale 58 61  
Carrying Value [Member] | Deposits Without Fixed Maturities [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Deposits 99,148 100,502  
Carrying Value [Member] | Deposits With Fixed Maturities [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Deposits 10,682 9,834  
Estimate of fair value [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Short-term financial assets 18,964 12,304  
Federal funds sold and securities purchased under agreements to resell 9,472 32,538  
Securities held-to-maturity 14,005 13,902  
Short-term financial liabilities 3,327 2,667  
Deposits held for sale 291 673  
Long-term debt 19,828 22,717  
Estimate of fair value [Member] | Commercial Loans [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans, net of allowance for credit losses 48,946 54,210  
Loans held for sale 68 177  
Estimate of fair value [Member] | Consumer Loans [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans, net of allowance for credit losses 18,702 18,598  
Estimate of fair value [Member] | Consumer Loans [Member] | Residential Mortgage [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans held for sale 6 6  
Estimate of fair value [Member] | Consumer Loans [Member] | Other consumer [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Loans held for sale 58 61  
Estimate of fair value [Member] | Deposits Without Fixed Maturities [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Deposits 99,148 100,502  
Estimate of fair value [Member] | Deposits With Fixed Maturities [Member]      
Fair Value Of Other Financial Instrument [Line Items]      
Deposits $ 10,636 $ 9,782  
[1] In addition to the changes discussed above, in conjunction with HSBC's adoption of the requirements of IFRS 9 we also adopted changes in presentation under the Group Reporting Basis related to affiliate loans and deposits as well as cash collateral posted and received. Beginning January 1, 2018, affiliate loans have been reclassified from other assets to loans, affiliate deposits have been reclassified from other liabilities to deposits, cash collateral posted has been reclassified from loans to other assets and cash collateral received has been reclassified from deposits to other liabilities. As a result of these changes, total loans, net and total deposits in the GB&M segment increased $0.2 billion and $10.8 billion, respectively, and total loans, net and total deposits in the CC segment decreased $3.0 billion and $0.9 billion, respectively, at March 31, 2018.