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Investment Securities - Gross Unrealized Losses and Fair Value of Company's Investment Securities (Detail)
$ in Millions
Jun. 30, 2019
USD ($)
Continuous Gross Unrealized Losses And Fair Value [Abstract]  
Fair Value Less Than 12 Months $ 1,279
Unrealized Losses Less Than 12 Months (4)
Fair Value 12 Months or Greater 23,033
Unrealized Losses 12 Months or Greater (258)
Fair Value Total 24,312
Unrealized Losses Total (262)
Fair Value Less Than 12 Months 3,017
Unrealized Losses Less Than 12 Months (9)
Fair Value 12 Months or Greater 29,030
Unrealized Losses 12 Months or Greater (332)
Fair Value Total 32,047
Unrealized Losses Total (341)
Other Asset-Backed Securities [Member]  
Continuous Gross Unrealized Losses And Fair Value [Abstract]  
Fair Value Less Than 12 Months 8
Fair Value Total 8
U.S. Treasury and Agencies [Member]  
Continuous Gross Unrealized Losses And Fair Value [Abstract]  
Fair Value 12 Months or Greater 2,872
Unrealized Losses 12 Months or Greater (21)
Fair Value Total 2,872
Unrealized Losses Total (21)
Fair Value 12 Months or Greater 9,571
Unrealized Losses 12 Months or Greater (57)
Fair Value Total 9,571
Unrealized Losses Total (57)
Residential Mortgage-Backed Securities [Member] | Agency [Member]  
Continuous Gross Unrealized Losses And Fair Value [Abstract]  
Fair Value Less Than 12 Months 1,268
Unrealized Losses Less Than 12 Months (4)
Fair Value 12 Months or Greater 20,159
Unrealized Losses 12 Months or Greater (237)
Fair Value Total 21,427
Unrealized Losses Total (241)
Fair Value Less Than 12 Months 2,949
Unrealized Losses Less Than 12 Months (9)
Fair Value 12 Months or Greater 19,154
Unrealized Losses 12 Months or Greater (272)
Fair Value Total 22,103
Unrealized Losses Total (281)
Obligations of State and Political Subdivisions [Member]  
Continuous Gross Unrealized Losses And Fair Value [Abstract]  
Fair Value Less Than 12 Months 68
Fair Value 12 Months or Greater 305
Unrealized Losses 12 Months or Greater (3)
Fair Value Total 373
Unrealized Losses Total (3)
Asset-Backed Securities [Member] | Other Asset-Backed Securities [Member]  
Continuous Gross Unrealized Losses And Fair Value [Abstract]  
Fair Value 12 Months or Greater 2
Fair Value Total 2
Obligations of Foreign Governments [Member]  
Continuous Gross Unrealized Losses And Fair Value [Abstract]  
Fair Value Less Than 12 Months 3
Fair Value Total $ 3