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Fair Value Measurement - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Assets:      
Securities available for sale (amortized cost of $78.6 billion and allowance for credit losses of $5 million as of March 31, 2020) $ 81,423 $ 79,213  
Loans held for sale 1,100 251  
Derivative assets, gross amount 6,617 1,729  
Derivative asset, netting adjustments (3,567) (633)  
Derivative asset 3,050 1,096  
Liabilities:      
Derivative liabilities, gross amount 3,884 1,197  
Derivative liability, netting adjustments (1,127) (523)  
Derivative liability 2,757 674  
Net valuation allowance 19 12  
Level 1      
Assets:      
Loans held for sale   0  
Level 2      
Assets:      
Loans held for sale   149  
Level 3      
Assets:      
Loans held for sale   0  
Recurring      
Assets:      
Securities available for sale (amortized cost of $78.6 billion and allowance for credit losses of $5 million as of March 31, 2020) 81,423 79,213  
Loans held for sale 1,056 251  
Derivative asset 3,050 1,096  
Other assets 360 410  
Total assets 85,889 80,970  
Liabilities:      
Derivative liability 2,757 674  
Recurring | Level 1      
Assets:      
Securities available for sale (amortized cost of $78.6 billion and allowance for credit losses of $5 million as of March 31, 2020) 4,553 4,355  
Loans held for sale 0 0  
Derivative assets, gross amount 589 84  
Other assets 301 344  
Total assets 5,443 4,783  
Other assets:      
Deferred compensation plan assets 300 343  
Equity securities 1 1  
Liabilities:      
Derivative liabilities, gross amount 361 17  
Recurring | Level 2      
Assets:      
Securities available for sale (amortized cost of $78.6 billion and allowance for credit losses of $5 million as of March 31, 2020) 76,461 74,416  
Loans held for sale 1,056 251  
Derivative assets, gross amount 5,881 1,568  
Other assets 0 0  
Total assets 83,398 76,235  
Liabilities:      
Derivative liabilities, gross amount 3,442 1,129  
Recurring | Level 3      
Assets:      
Securities available for sale (amortized cost of $78.6 billion and allowance for credit losses of $5 million as of March 31, 2020) 409 442  
Loans held for sale 0 0  
Derivative assets, gross amount 147 77 $ 42
Other assets 59 66  
Total assets 615 585  
Other assets:      
Retained interests in securitizations 59 66  
Liabilities:      
Derivative liabilities, gross amount 81 51 $ 36
U.S. Treasury securities      
Assets:      
Securities available for sale (amortized cost of $78.6 billion and allowance for credit losses of $5 million as of March 31, 2020) 4,360 4,124  
U.S. Treasury securities | Recurring      
Assets:      
Securities available for sale (amortized cost of $78.6 billion and allowance for credit losses of $5 million as of March 31, 2020) 4,360 4,124  
U.S. Treasury securities | Recurring | Level 1      
Assets:      
Securities available for sale (amortized cost of $78.6 billion and allowance for credit losses of $5 million as of March 31, 2020) 4,360 4,124  
U.S. Treasury securities | Recurring | Level 2      
Assets:      
Securities available for sale (amortized cost of $78.6 billion and allowance for credit losses of $5 million as of March 31, 2020) 0 0  
U.S. Treasury securities | Recurring | Level 3      
Assets:      
Securities available for sale (amortized cost of $78.6 billion and allowance for credit losses of $5 million as of March 31, 2020) 0 0  
RMBS      
Assets:      
Securities available for sale (amortized cost of $78.6 billion and allowance for credit losses of $5 million as of March 31, 2020) 65,741 64,338  
RMBS | Recurring      
Assets:      
Securities available for sale (amortized cost of $78.6 billion and allowance for credit losses of $5 million as of March 31, 2020) 65,741 64,338  
RMBS | Recurring | Level 1      
Assets:      
Securities available for sale (amortized cost of $78.6 billion and allowance for credit losses of $5 million as of March 31, 2020) 0 0  
RMBS | Recurring | Level 2      
Assets:      
Securities available for sale (amortized cost of $78.6 billion and allowance for credit losses of $5 million as of March 31, 2020) 65,368 63,909  
RMBS | Recurring | Level 3      
Assets:      
Securities available for sale (amortized cost of $78.6 billion and allowance for credit losses of $5 million as of March 31, 2020) 373 429  
CMBS | Recurring      
Assets:      
Securities available for sale (amortized cost of $78.6 billion and allowance for credit losses of $5 million as of March 31, 2020) 10,084 9,426  
CMBS | Recurring | Level 1      
Assets:      
Securities available for sale (amortized cost of $78.6 billion and allowance for credit losses of $5 million as of March 31, 2020) 0 0  
CMBS | Recurring | Level 2      
Assets:      
Securities available for sale (amortized cost of $78.6 billion and allowance for credit losses of $5 million as of March 31, 2020) 10,048 9,413  
CMBS | Recurring | Level 3      
Assets:      
Securities available for sale (amortized cost of $78.6 billion and allowance for credit losses of $5 million as of March 31, 2020) 36 13  
Other securities      
Assets:      
Securities available for sale (amortized cost of $78.6 billion and allowance for credit losses of $5 million as of March 31, 2020) 1,238 1,325  
Other securities | Recurring      
Assets:      
Securities available for sale (amortized cost of $78.6 billion and allowance for credit losses of $5 million as of March 31, 2020) 1,238 1,325  
Other securities | Recurring | Level 1      
Assets:      
Securities available for sale (amortized cost of $78.6 billion and allowance for credit losses of $5 million as of March 31, 2020) 193 231  
Other securities | Recurring | Level 2      
Assets:      
Securities available for sale (amortized cost of $78.6 billion and allowance for credit losses of $5 million as of March 31, 2020) 1,045 1,094  
Other securities | Recurring | Level 3      
Assets:      
Securities available for sale (amortized cost of $78.6 billion and allowance for credit losses of $5 million as of March 31, 2020) $ 0 $ 0