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Information about Changes in Fair Value of Level 3 Assets (Detail) - Available-for-Sale Debt Securities - INR (₨)
₨ in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance ₨ 38,812.9 ₨ 18,534.6
Total gains or losses (realized/unrealized) -Included in net income 0.0 0.0
Total gains or losses (realized/unrealized)- Included in other comprehensive income 1,535.5 355.9
Purchases/additions 126,891.3 42,885.7
Sales 0.0 0.0
Issuances 0.0 0.0
Settlements (39,785.4) (22,963.3)
Transfers in Level 3 0.0 0.0
Transfers out of Level 3 0.0 0.0
Foreign currency translation adjustment 0.0 0.0
Ending Balance 127,454.3 38,812.9
Total amount of gains or (losses) included in net income attributable to change in unrealized gains or (losses) relating to assets still held at reporting date ₨ 0.0 ₨ 0.0