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Amortized Cost and Fair Value of Investments in Debt Securities by Estimated Average Life (Detail)
$ in Millions
Mar. 31, 2019
USD ($)
Distribution of Maturities: Amortized Cost, 1 Year or Less $ 2,183
Distribution of Maturities: Amortized Cost, 1-5 Years 6,907
Distribution of Maturities: Amortized Cost, 5-10 Years 21,095
Distribution of Maturities: Amortized Cost, After 10 Years 1,643
Distribution of Maturities: Amortized Cost, Total 31,828
Distribution of Maturities: Fair Value, 1 Year or Less 2,229
Distribution of Maturities: Fair Value, 1-5 Years 6,896
Distribution of Maturities: Fair Value, 5-10 Years 21,102
Distribution of Maturities: Fair Value, After 10 Years 1,626
Distribution of Maturities: Fair Value, Total $ 31,853
Available For Sale Securities Debt Maturities, Yield, One Year Or Less 2.78% [1]
Available For Sale Securities Debt Maturities, Yield, After One Through Five Years 2.36% [1]
Available For Sale Securities Debt Maturities, Yield, After Five Through Ten Years 3.01% [1]
Available For Sale Securities Debt Maturities, Yield, After Ten Years 3.08% [1]
Available For Sale Securities Debt Maturities, Yield 2.86% [1]
US Treasury Securities [Member]  
Distribution of Maturities: Amortized Cost, 1 Year or Less $ 649
Distribution of Maturities: Amortized Cost, 1-5 Years 2,312
Distribution of Maturities: Amortized Cost, 5-10 Years 1,318
Distribution of Maturities: Amortized Cost, After 10 Years 0
Distribution of Maturities: Amortized Cost, Total 4,279
Distribution of Maturities: Fair Value, 1 Year or Less 645
Distribution of Maturities: Fair Value, 1-5 Years 2,295
Distribution of Maturities: Fair Value, 5-10 Years 1,319
Distribution of Maturities: Fair Value, After 10 Years 0
Distribution of Maturities: Fair Value, Total 4,259
US Government Agencies Debt Securities [Member]  
Distribution of Maturities: Amortized Cost, 1 Year or Less 39
Distribution of Maturities: Amortized Cost, 1-5 Years 33
Distribution of Maturities: Amortized Cost, 5-10 Years 4
Distribution of Maturities: Amortized Cost, After 10 Years 67
Distribution of Maturities: Amortized Cost, Total 143
Distribution of Maturities: Fair Value, 1 Year or Less 39
Distribution of Maturities: Fair Value, 1-5 Years 33
Distribution of Maturities: Fair Value, 5-10 Years 4
Distribution of Maturities: Fair Value, After 10 Years 66
Distribution of Maturities: Fair Value, Total 142
US States and Political Subdivisions Debt Securities [Member]  
Distribution of Maturities: Amortized Cost, 1 Year or Less 1
Distribution of Maturities: Amortized Cost, 1-5 Years 91
Distribution of Maturities: Amortized Cost, 5-10 Years 44
Distribution of Maturities: Amortized Cost, After 10 Years 458
Distribution of Maturities: Amortized Cost, Total 594
Distribution of Maturities: Fair Value, 1 Year or Less 1
Distribution of Maturities: Fair Value, 1-5 Years 95
Distribution of Maturities: Fair Value, 5-10 Years 45
Distribution of Maturities: Fair Value, After 10 Years 452
Distribution of Maturities: Fair Value, Total 593
Other Debt Obligations [Member]  
Distribution of Maturities: Amortized Cost, 1 Year or Less 0
Distribution of Maturities: Amortized Cost, 1-5 Years 13
Distribution of Maturities: Amortized Cost, 5-10 Years 0
Distribution of Maturities: Amortized Cost, After 10 Years 0
Distribution of Maturities: Amortized Cost, Total 13
Distribution of Maturities: Fair Value, 1 Year or Less 0
Distribution of Maturities: Fair Value, 1-5 Years 13
Distribution of Maturities: Fair Value, 5-10 Years 0
Distribution of Maturities: Fair Value, After 10 Years 0
Distribution of Maturities: Fair Value, Total 13
Residential Mortgage Backed Securities [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]  
Distribution of Maturities: Amortized Cost, 1 Year or Less 1,494
Distribution of Maturities: Amortized Cost, 1-5 Years 3,800
Distribution of Maturities: Amortized Cost, 5-10 Years 17,081
Distribution of Maturities: Amortized Cost, After 10 Years 774
Distribution of Maturities: Amortized Cost, Total 23,149
Distribution of Maturities: Fair Value, 1 Year or Less 1,544
Distribution of Maturities: Fair Value, 1-5 Years 3,809
Distribution of Maturities: Fair Value, 5-10 Years 17,086
Distribution of Maturities: Fair Value, After 10 Years 771
Distribution of Maturities: Fair Value, Total 23,210
Commercial Mortgage Backed Securities [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]  
Distribution of Maturities: Amortized Cost, 1 Year or Less 0
Distribution of Maturities: Amortized Cost, 1-5 Years 646
Distribution of Maturities: Amortized Cost, 5-10 Years 1,672
Distribution of Maturities: Amortized Cost, After 10 Years 323
Distribution of Maturities: Amortized Cost, Total 2,641
Distribution of Maturities: Fair Value, 1 Year or Less 0
Distribution of Maturities: Fair Value, 1-5 Years 639
Distribution of Maturities: Fair Value, 5-10 Years 1,669
Distribution of Maturities: Fair Value, After 10 Years 316
Distribution of Maturities: Fair Value, Total 2,624
Commercial Mortgage Backed Securities [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]  
Distribution of Maturities: Amortized Cost, 1 Year or Less 0
Distribution of Maturities: Amortized Cost, 1-5 Years 12
Distribution of Maturities: Amortized Cost, 5-10 Years 976
Distribution of Maturities: Amortized Cost, After 10 Years 21
Distribution of Maturities: Amortized Cost, Total 1,009
Distribution of Maturities: Fair Value, 1 Year or Less 0
Distribution of Maturities: Fair Value, 1-5 Years 12
Distribution of Maturities: Fair Value, 5-10 Years 979
Distribution of Maturities: Fair Value, After 10 Years 21
Distribution of Maturities: Fair Value, Total $ 1,012
[1] Weighted average yields are based on amortized cost and presented on an FTE basis.