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Stock - Additional Information (Detail) - INR (₨) ₨ / shares in Units, ₨ in Millions |  | 1 Months Ended | 8 Months Ended | 12 Months Ended |  |
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Jul. 01, 2023 | Jul. 31, 2016 | Dec. 31, 2022 | Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023 | Jun. 30, 2013 | Jun. 30, 2010 | Jun. 30, 2007 | Jun. 30, 2005 | Jun. 30, 2003 | Jan. 31, 2000 | May 14, 2022 | Mar. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation, intrinsic value of options exercised at grant date |  |  |  | ₨ 7,049.2 | ₨ 5,249.6 | ₨ 0.5 |  |  |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options exercised at exercise date |  |  |  | 33,349.8 | 14,548.0 | 20,891.2 |  |  |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options outstanding at grant date |  |  |  | 16,009.7 | 22,732.3 |  |  |  |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options outstanding |  |  |  | 58,662.2 | 28,677.5 |  |  |  |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options exercisable at grant date |  |  |  | 15,158.2 | 20,373.6 |  |  |  |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options exercisable |  |  |  | ₨ 44,594.6 | ₨ 24,363.8 |  |  |  |  |  |  |  |  |
Stock-based compensation, unvested options, outstanding |  |  |  | 60,038,973 | 76,731,732 |  |  |  |  |  |  |  |  |
Stock-based compensation, unvested options, weighted average exercise price |  |  |  | ₨ 1,593.9 | ₨ 1,446.2 |  |  |  |  |  |  |  |  |
Stock-based compensation, unvested options, aggregate intrinsic value at grant date |  |  |  | ₨ 851.5 | ₨ 2,217.7 |  |  |  |  |  |  |  |  |
Stock-based compensation, unvested options, aggregate intrinsic value as at end of period |  |  |  | 14,067.6 | ₨ 4,197.5 |  |  |  |  |  |  |  |  |
Stock-based compensation, total estimated compensation cost to be recognized in future periods |  |  |  | ₨ 17,782.1 |  |  |  |  |  |  |  |  |  |
Equity shares, par value |  |  |  | ₨ 1 | ₨ 1 |  |  |  |  |  |  |  |  |
Share-based payment arrangement, exercise of option, tax benefit |  |  |  | ₨ 7,041.2 | ₨ 5,561.5 | 0.0 |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-Based Payment Arrangement, Amount |  |  |  | ₨ (1,157.2) | 20,166.2 | 0.0 |  |  |  |  |  |  |  |
eHDFC [Member] | Background and Details of the Business Combination [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity shares, par value | ₨ 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation by share based award options granted during the period | 48,559,681 |  |  |  |  |  |  |  |  |  |  |  |  |
Employee Stock Option |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation, weighted average period of recognition of total compensation cost not yet recognized (in years) |  |  |  | 1 year 10 months 24 days |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, expense |  |  |  | ₨ 13,878.7 | ₨ 17,379.5 | ₨ 13,132.8 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  |  | 141,374,510 | 175,659,424 | 151,682,461 |  |  |  |  |  |  |  | 158,106,016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  |  | 52,955,047 | 46,304,966 | 34,201,810 |  |  |  |  |  |  |  |
Share based compensation by share based award options granted during the period |  |  |  | 23,146,660 | 24,384,690 | 30,480,145 |  |  |  |  |  |  |  |
Employee Stock Option | Plan ''A'' |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employees' Stock Option Scheme, equity shares reserved for issuance |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |
Employees' Stock Option Scheme, aggregate nominal value of equity shares reserved |  |  |  |  |  |  |  |  |  |  |  | ₨ 100.0 |  |
Employee Stock Option | Plan ''B'' |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employees' Stock Option Scheme, equity shares reserved for issuance |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |
Employees' Stock Option Scheme, aggregate nominal value of equity shares reserved |  |  |  |  |  |  |  |  |  |  | ₨ 100.0 |  |  |
Employee Stock Option | Plan ''C'' |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employees' Stock Option Scheme, equity shares reserved for issuance |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |
Employees' Stock Option Scheme, aggregate nominal value of equity shares reserved |  |  |  |  |  |  |  |  |  | ₨ 100.0 |  |  |  |
Employee Stock Option | Plan ''D'' |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employees' Stock Option Scheme, equity shares reserved for issuance |  |  |  |  |  |  |  |  | 150,000,000 |  |  |  |  |
Employees' Stock Option Scheme, aggregate nominal value of equity shares reserved |  |  |  |  |  |  |  |  | ₨ 150.0 |  |  |  |  |
Employee Stock Option | Plan "E" |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employees' Stock Option Scheme, equity shares reserved for issuance |  |  |  |  |  |  |  | 200,000,000 |  |  |  |  |  |
Employees' Stock Option Scheme, aggregate nominal value of equity shares reserved |  |  |  |  |  |  |  | ₨ 200.0 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  |  | 4,793,680 |  |  |  |  |  |  |  |  |  |
Employee Stock Option | Plan "F" |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employees' Stock Option Scheme, equity shares reserved for issuance |  |  |  |  |  |  | 200,000,000 |  |  |  |  |  |  |
Employees' Stock Option Scheme, aggregate nominal value of equity shares reserved |  |  |  |  |  |  | ₨ 200.0 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  |  | 11,490,680 |  |  |  |  |  |  |  |  |  |
Employee Stock Option | Plan "G" |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employees' Stock Option Scheme, equity shares reserved for issuance |  | 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Employees' Stock Option Scheme, aggregate nominal value of equity shares reserved |  | ₨ 200.0 |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  |  | 74,981,293 |  |  |  |  |  |  |  |  |  |
Employee Stock Option | Plan "H" |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employees' Stock Option Scheme, equity shares reserved for issuance |  |  |  | 95,000,000 |  |  |  |  |  |  |  |  |  |
Employees' Stock Option Scheme, aggregate nominal value of equity shares reserved |  |  |  | ₨ 95.0 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  |  | 22,572,860 |  |  |  |  |  |  |  |  |  |
Employee Stock Option | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employees' Stock Option Scheme, expiration |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation, intrinsic value of options exercised at grant date |  |  |  | ₨ 3,586.4 | ₨ 441.6 |  |  |  |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options outstanding at grant date |  |  |  | 24,360.4 | 18,122.0 |  |  |  |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options outstanding |  |  |  | 27,198.7 | 16,960.3 |  |  |  |  |  |  |  |  |
Stock-based compensation, total estimated compensation cost to be recognized in future periods |  |  |  | ₨ 12,379.8 |  |  |  |  |  |  |  |  |  |
Stock-based compensation, weighted average period of recognition of total compensation cost not yet recognized (in years) |  |  |  | 1 year 9 months 18 days |  |  |  |  |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of RSUs exercised at exercise date |  |  |  | ₨ 4,304.8 | 458.1 |  |  |  |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of RSUs exercisable at grant date |  |  |  | 1,854.3 | 525.9 |  |  |  |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of RSUs exercisable |  |  |  | 2,205.8 | 544.1 |  |  |  |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of RSUs non-vested at grant date |  |  |  | 13,678,230.0 | 11,345,734.0 |  |  |  |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of RSUs non-vested |  |  |  | 22,506.2 | 17,596.1 |  |  |  |  |  |  |  |  |
Stock based compensation, aggregate intrinsic value of RSUs future period |  |  |  | ₨ 24,992.9 | ₨ 16,416.1 |  |  |  |  |  |  |  |  |
Weighted average fair value of RSUs granted during the year |  |  |  | ₨ 1 | ₨ 1 |  |  |  |  |  |  |  |  |
Share-based payment arrangement, expense |  |  |  | ₨ 10,755.2 | ₨ 2,736.3 |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Employee Stock Incentive Master Scheme Two Thousand And Twenty Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employees' Stock Option Scheme, equity shares reserved for issuance |  |  |  |  |  |  |  |  |  |  |  |  | 100 |
Equity shares, par value |  |  |  |  |  |  |  |  |  |  |  |  | ₨ 1 |
Common stock shares reserved for future issuance aggregate par value |  |  |  |  |  |  |  |  |  |  |  |  | ₨ 100.0 |
Share based compensation by share based award vesting period one |  |  | 4 years |  |  |  |  |  |  |  |  |  |  |
Share based compensation by share based award number of shares authorized for grant |  |  |  |  |  | 2,891,000 |  |  |  |  |  |  |  |
Weighted average fair value of RSUs granted during the year |  |  |  | ₨ 1,724.68 | ₨ 1,565.43 | ₨ 1,382.34 |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Employee Stock Incentive Master Scheme Two Thousand And Twenty Two [Member] | Scheme Zero Zero Four [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation by share based award number of shares authorized for grant |  |  |  |  | 9,354,224 |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Employee Stock Incentive Master Scheme Two Thousand And Twenty Two [Member] | Scheme Zero Zero Seven [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation by share based award number of shares authorized for grant |  |  |  | 6,254,575 |  |  |  |  |  |  |  |  |  |
Scheme XXXVIII | Plan "G" |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation, options granted |  |  |  |  |  | 30,480,145 |  |  |  |  |  |  |  |
Scheme XLV | Plan "E" |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation, options granted |  |  |  |  | 5,075,360 |  |  |  |  |  |  |  |  |
Scheme XLV | Plan "F" |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation, options granted |  |  |  |  | 12,533,590 |  |  |  |  |  |  |  |  |
Scheme XLV | Plan "G" |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation, options granted |  |  |  |  | 6,775,740 |  |  |  |  |  |  |  |  |
Schemes LVI to LIX [Member] | Plan "G" |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation, options granted |  |  |  | 573,800 |  |  |  |  |  |  |  |  |  |
Schemes LVI to LIX [Member] | Plan "H" |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation, options granted |  |  |  | 22,572,860 |  |  |  |  |  |  |  |  |  |
HDFC Life [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  |  | 14,049,678 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  |  | 7,886,415 |  |  |  |  |  |  |  |  |  |
HDFC AMC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  |  | 2,018,029 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  |  | 1,295,700 |  |  |  |  |  |  |  |  |  |
HDFC Capital Advisors [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  |  | 71,678 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  |  | 71,678 |  |  |  |  |  |  |  |  |  |
HDFC Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  |  | 746,134 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  |  | 143,393 |  |  |  |  |  |  |  |  |  |
HDB Financial Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  |  | 8,356,111 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  |  | 1,953,960 |  |  |  |  |  |  |  |  |  |

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