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Derivative Financial Instruments (Offsetting Liabilities) (Detail) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Derivative [Line Items]    
Gross assets presented in the consolidated balance sheet $ 15  
Liability    
Derivative [Line Items]    
Gross assets presented in the consolidated balance sheet [1] 22 $ 27
Gross amounts not offset in the consolidated balance sheet, financial instruments 0 0
Gross amounts not offset in the consolidated balance sheet, cash collateral received 11 17
Gross amounts not offset in the consolidated balance sheet, net amounts 11 10
Liability | Interest Rate Contract [Member] | Over The Counter [Member]    
Derivative [Line Items]    
Gross assets presented in the consolidated balance sheet [1] 22 27
Gross amounts not offset in the consolidated balance sheet, financial instruments 0 0
Gross amounts not offset in the consolidated balance sheet, cash collateral received 11 17
Gross amounts not offset in the consolidated balance sheet, net amounts $ 11 $ 10
[1] Excludes $28 million and $ million of derivative liabilities at June 30, 2021 and December 31, 2020, respectively, which are not subject to master netting or similar arrangements.