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Amortized Cost and Fair Value of Investments in Debt Securities by Estimated Average Life (Detail)
$ in Millions
Sep. 30, 2018
USD ($)
Distribution of Maturities: Amortized Cost, 1 Year or Less $ 1,751
Distribution of Maturities: Amortized Cost, 1-5 Years 9,776
Distribution of Maturities: Amortized Cost, 5-10 Years 19,202
Distribution of Maturities: Amortized Cost, After 10 Years 1,173
Distribution of Maturities: Amortized Cost, Total 31,902
Distribution of Maturities: Fair Value, 1 Year or Less 1,807
Distribution of Maturities: Fair Value, 1-5 Years 9,533
Distribution of Maturities: Fair Value, 5-10 Years 18,518
Distribution of Maturities: Fair Value, After 10 Years 1,126
Distribution of Maturities: Fair Value, Total $ 30,984
Available For Sale Securities Debt Maturities, Yield, One Year Or Less 3.22% [1]
Available For Sale Securities Debt Maturities, Yield, After One Through Five Years 2.38% [1]
Available For Sale Securities Debt Maturities, Yield, After Five Through Ten Years 2.94% [1]
Available For Sale Securities Debt Maturities, Yield, After Ten Years 3.12% [1]
Available For Sale Securities Debt Maturities, Yield 2.79% [1]
US Treasury Securities [Member]  
Distribution of Maturities: Amortized Cost, 1 Year or Less $ 15
Distribution of Maturities: Amortized Cost, 1-5 Years 2,695
Distribution of Maturities: Amortized Cost, 5-10 Years 1,565
Distribution of Maturities: Amortized Cost, After 10 Years 0
Distribution of Maturities: Amortized Cost, Total 4,275
Distribution of Maturities: Fair Value, 1 Year or Less 15
Distribution of Maturities: Fair Value, 1-5 Years 2,615
Distribution of Maturities: Fair Value, 5-10 Years 1,503
Distribution of Maturities: Fair Value, After 10 Years 0
Distribution of Maturities: Fair Value, Total 4,133
US Government Agencies Debt Securities [Member]  
Distribution of Maturities: Amortized Cost, 1 Year or Less 113
Distribution of Maturities: Amortized Cost, 1-5 Years 28
Distribution of Maturities: Amortized Cost, 5-10 Years 8
Distribution of Maturities: Amortized Cost, After 10 Years 75
Distribution of Maturities: Amortized Cost, Total 224
Distribution of Maturities: Fair Value, 1 Year or Less 114
Distribution of Maturities: Fair Value, 1-5 Years 28
Distribution of Maturities: Fair Value, 5-10 Years 8
Distribution of Maturities: Fair Value, After 10 Years 73
Distribution of Maturities: Fair Value, Total 223
US States and Political Subdivisions Debt Securities [Member]  
Distribution of Maturities: Amortized Cost, 1 Year or Less 3
Distribution of Maturities: Amortized Cost, 1-5 Years 72
Distribution of Maturities: Amortized Cost, 5-10 Years 25
Distribution of Maturities: Amortized Cost, After 10 Years 521
Distribution of Maturities: Amortized Cost, Total 621
Distribution of Maturities: Fair Value, 1 Year or Less 3
Distribution of Maturities: Fair Value, 1-5 Years 75
Distribution of Maturities: Fair Value, 5-10 Years 25
Distribution of Maturities: Fair Value, After 10 Years 499
Distribution of Maturities: Fair Value, Total 602
Other Debt Obligations [Member]  
Distribution of Maturities: Amortized Cost, 1 Year or Less 0
Distribution of Maturities: Amortized Cost, 1-5 Years 14
Distribution of Maturities: Amortized Cost, 5-10 Years 0
Distribution of Maturities: Amortized Cost, After 10 Years 0
Distribution of Maturities: Amortized Cost, Total 14
Distribution of Maturities: Fair Value, 1 Year or Less 0
Distribution of Maturities: Fair Value, 1-5 Years 14
Distribution of Maturities: Fair Value, 5-10 Years 0
Distribution of Maturities: Fair Value, After 10 Years 0
Distribution of Maturities: Fair Value, Total 14
Residential Mortgage Backed Securities [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]  
Distribution of Maturities: Amortized Cost, 1 Year or Less 1,619
Distribution of Maturities: Amortized Cost, 1-5 Years 6,488
Distribution of Maturities: Amortized Cost, 5-10 Years 14,736
Distribution of Maturities: Amortized Cost, After 10 Years 269
Distribution of Maturities: Amortized Cost, Total 23,112
Distribution of Maturities: Fair Value, 1 Year or Less 1,674
Distribution of Maturities: Fair Value, 1-5 Years 6,341
Distribution of Maturities: Fair Value, 5-10 Years 14,230
Distribution of Maturities: Fair Value, After 10 Years 260
Distribution of Maturities: Fair Value, Total 22,505
Commercial Mortgage Backed Securities [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]  
Distribution of Maturities: Amortized Cost, 1 Year or Less 1
Distribution of Maturities: Amortized Cost, 1-5 Years 467
Distribution of Maturities: Amortized Cost, 5-10 Years 1,937
Distribution of Maturities: Amortized Cost, After 10 Years 308
Distribution of Maturities: Amortized Cost, Total 2,713
Distribution of Maturities: Fair Value, 1 Year or Less 1
Distribution of Maturities: Fair Value, 1-5 Years 448
Distribution of Maturities: Fair Value, 5-10 Years 1,859
Distribution of Maturities: Fair Value, After 10 Years 294
Distribution of Maturities: Fair Value, Total 2,602
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 931
Distribution of Maturities: Amortized Cost, After 10 Years 0
Distribution of Maturities: Amortized Cost, Total 943
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 893
Distribution of Maturities: Fair Value, After 10 Years 0
Distribution of Maturities: Fair Value, Total $ 905
[1] Weighted average yields are based on amortized cost and presented on an FTE basis.