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Guarantees and Contingent Liabilities - Summary of Other Guarantees and Contingent Liabilities (Detail)
$ in Millions
Jun. 30, 2018
USD ($)
Standby Letters of Credit [Member]  
Guarantor Obligations [Line Items]  
Carrying Amount $ 52
Maximum Potential Future Payments 11,057
Third Party Borrowing Arrangements [Member]  
Guarantor Obligations [Line Items]  
Maximum Potential Future Payments 11
Securities Lending Indemnifications [Member]  
Guarantor Obligations [Line Items]  
Collateral Held 3,908
Maximum Potential Future Payments 3,820
Asset Sales [Member]  
Guarantor Obligations [Line Items]  
Carrying Amount 119
Maximum Potential Future Payments 6,818
Merchant Processing [Member]  
Guarantor Obligations [Line Items]  
Collateral Held 746
Carrying Amount 68
Maximum Potential Future Payments 107,444
Tender Option Bond Program Guarantee [Member]  
Guarantor Obligations [Line Items]  
Collateral Held 2,420
Maximum Potential Future Payments 2,334
Minimum Revenue Guarantees [Member]  
Guarantor Obligations [Line Items]  
Maximum Potential Future Payments 6
Other Guarantees [Member]  
Guarantor Obligations [Line Items]  
Carrying Amount 22
Maximum Potential Future Payments $ 1,409