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Investment Securities (Investment Portfolio) (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Mar. 31, 2024
Available-for-sale securities |  |
Total | $ 28,416,000,000 | $ 28,114,000,000
Gross unrealized gains | 9,000,000 | 4,000,000
Gross unrealized losses | (4,010,000,000) | (4,434,000,000)
Fair value | 24,415,000,000 | 23,684,000,000
Held-to-maturity securities |  |
Amortized cost | 4,680,000,000 | 4,655,000,000
Gross unrealized gains | 222,000,000 | 172,000,000
Gross unrealized losses | (173,000,000) | (194,000,000)
Fair value | 4,729,000,000 | 4,633,000,000
Debt securities, available-for-sale, accrued interest receivable | $ 76,000,000 | $ 75,000,000
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Other assets | Other assets
Debt securities, available-for-sale, allowance for credit loss, excluding accrued interest | $ 0 | $ 0
Debt securities, held-to-maturity, allowance for credit loss, excluding accrued interest | 0 | 0
Debt securities, held-to-maturity, accrued interest receivable | 13,000,000 | 13,000,000
Debt securities, transferred from available-for-sale To held-to-maturity, fair value | 3,600,000,000 |
Debt securities, transferred from available-for-sale to held-to-maturity, accumulated gross unrealized loss, before tax | 911,000,000 |
Operating Segments | Insurance operations |  |
Held-to-maturity securities |  |
Deposit securities | 12,000,000 | 12,000,000
Asset Pledged as Collateral with Right |  |
Available-for-sale securities |  |
Fair value | 4,700,000,000 | 3,700,000,000
Held-to-maturity securities |  |
Securities with the right to sell or pledge | 1,400,000,000 | 569,000,000
Asset Pledged as Collateral with Right | Federal Home Loan Bank advances |  |
Held-to-maturity securities |  |
Securities with the right to sell or pledge | 3,300,000,000 | 3,200,000,000
U.S. Treasury and federal agencies |  |
Available-for-sale securities |  |
Total | 2,284,000,000 | 2,286,000,000
Gross unrealized gains | 0 | 0
Gross unrealized losses | (209,000,000) | (229,000,000)
Fair value | 2,075,000,000 | 2,057,000,000
U.S. States and political subdivisions |  |
Available-for-sale securities |  |
Total | 727,000,000 | 720,000,000
Gross unrealized gains | 1,000,000 | 0
Gross unrealized losses | (70,000,000) | (77,000,000)
Fair value | 658,000,000 | 643,000,000
Foreign government |  |
Available-for-sale securities |  |
Total | 190,000,000 | 191,000,000
Gross unrealized gains | 1,000,000 | 1,000,000
Gross unrealized losses | (8,000,000) | (10,000,000)
Fair value | 183,000,000 | 182,000,000
Agency mortgage-backed residential |  |
Available-for-sale securities |  |
Total | 18,122,000,000 | 17,831,000,000
Gross unrealized gains | 1,000,000 | 0
Gross unrealized losses | (2,739,000,000) | (3,079,000,000)
Fair value | 15,384,000,000 | 14,752,000,000
Held-to-maturity securities |  |
Amortized cost | 999,000,000 | 984,000,000
Gross unrealized gains | 0 | 0
Gross unrealized losses | (173,000,000) | (194,000,000)
Fair value | 826,000,000 | 790,000,000
Hedged liability, fair value hedge, cumulative increase (decrease) |  | 77,000,000
Hedged asset, fair value hedge, cumulative increase (decrease) | 46,000,000 |
Mortgage-backed residential |  |
Available-for-sale securities |  |
Total | 268,000,000 | 264,000,000
Gross unrealized gains | 0 | 0
Gross unrealized losses | (43,000,000) | (45,000,000)
Fair value | 225,000,000 | 219,000,000
Held-to-maturity securities |  |
Amortized cost | 3,603,000,000 | 3,544,000,000
Gross unrealized gains | 221,000,000 | 171,000,000
Gross unrealized losses | 0 | 0
Fair value | 3,824,000,000 | 3,715,000,000
Agency mortgage-backed commercial |  |
Available-for-sale securities |  |
Total | 4,539,000,000 | 4,634,000,000
Gross unrealized gains | 2,000,000 | 1,000,000
Gross unrealized losses | (783,000,000) | (835,000,000)
Fair value | 3,758,000,000 | 3,800,000,000
Held-to-maturity securities |  |
Hedged liability, fair value hedge, cumulative increase (decrease) |  | 32,000,000
Hedged asset, fair value hedge, cumulative increase (decrease) | 29,000,000 |
Asset-backed |  |
Available-for-sale securities |  |
Total | 344,000,000 | 310,000,000
Gross unrealized gains | 0 | 0
Gross unrealized losses | (12,000,000) | (9,000,000)
Fair value | 332,000,000 | 301,000,000
Held-to-maturity securities |  |
Amortized cost | 78,000,000 | 127,000,000
Gross unrealized gains | 1,000,000 | 1,000,000
Gross unrealized losses | 0 | 0
Fair value | 79,000,000 | 128,000,000
Corporate debt |  |
Available-for-sale securities |  |
Total | 1,942,000,000 | 1,878,000,000
Gross unrealized gains | 4,000,000 | 2,000,000
Gross unrealized losses | (146,000,000) | (150,000,000)
Fair value | $ 1,800,000,000 | $ 1,730,000,000

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