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Investment Securities (Investment Table) (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Investments [Line Items] |  |
Debt securities, available-for-sale, fair value | $ 29,225 | $ 30,284
Debt securities, held-to-maturity, amortized cost | 1,390 | 1,568
Held-to-maturity securities, fair value | 1,476 | 1,600
Available-for-sale securities |  |
Schedule of Investments [Line Items] |  |
Securities pledged for Federal Home Loan Bank, at fair value | 215 | 1,900
Securities, amount eligible to be repledged or sold by counterparty | 215 | 118
Operating Segments | Insurance operations | Available-for-sale securities |  |
Schedule of Investments [Line Items] |  |
Deposit securities | 13 | 12
US Treasury | Available-for-sale securities |  |
Schedule of Investments [Line Items] |  |
Debt securities, available-for-sale, amortized cost | 784 | 2,059
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 23 | 6
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | 0 | (17)
Debt securities, available-for-sale, fair value | 807 | 2,048
US States and political subdivisions | Available-for-sale securities |  |
Schedule of Investments [Line Items] |  |
Debt securities, available-for-sale, amortized cost | 876 | 623
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 38 | 19
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | (1) | (1)
Debt securities, available-for-sale, fair value | 913 | 641
Foreign government | Available-for-sale securities |  |
Schedule of Investments [Line Items] |  |
Debt securities, available-for-sale, amortized cost | 153 | 184
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 9 | 3
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | 0 | (1)
Debt securities, available-for-sale, fair value | 162 | 186
Agency mortgage-backed residential |  |
Schedule of Investments [Line Items] |  |
Debt securities, held-to-maturity, amortized cost | 1,376 |
Agency mortgage-backed residential | Available-for-sale securities |  |
Schedule of Investments [Line Items] |  |
Debt securities, available-for-sale, amortized cost | 19,136 | 21,183
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 752 | 257
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | (4) | (36)
Debt securities, available-for-sale, fair value | 19,884 | 21,404
Agency mortgage-backed residential | Held-to-maturity securities |  |
Schedule of Investments [Line Items] |  |
Debt securities, held-to-maturity, amortized cost | 1,376 | 1,547
Debt securities, held-to-maturity, unrecognized gain | 86 | 38
Debt securities, held-to-maturity, unrecognized loss | 0 | (6)
Held-to-maturity securities, fair value | 1,462 | 1,579
Mortgage-backed residential | Available-for-sale securities |  |
Schedule of Investments [Line Items] |  |
Debt securities, available-for-sale, amortized cost | 3,387 | 2,841
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 42 | 20
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | (4) | (11)
Debt securities, available-for-sale, fair value | 3,425 | 2,850
Agency mortgage-backed commercial | Available-for-sale securities |  |
Schedule of Investments [Line Items] |  |
Debt securities, available-for-sale, amortized cost | 1,647 | 1,344
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 139 | 44
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | 0 | (6)
Debt securities, available-for-sale, fair value | 1,786 | 1,382
Mortgage-backed commercial | Available-for-sale securities |  |
Schedule of Investments [Line Items] |  |
Debt securities, available-for-sale, amortized cost | 41 | 41
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 0 | 1
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | (3) | 0
Debt securities, available-for-sale, fair value | 38 | 42
Asset-backed |  |
Schedule of Investments [Line Items] |  |
Debt securities, held-to-maturity, amortized cost | 14 |
Asset-backed | Available-for-sale securities |  |
Schedule of Investments [Line Items] |  |
Debt securities, available-for-sale, amortized cost | 352 | 365
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 4 | 3
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | 0 | 0
Debt securities, available-for-sale, fair value | 356 | 368
Asset-backed | Held-to-maturity securities |  |
Schedule of Investments [Line Items] |  |
Debt securities, held-to-maturity, amortized cost | 14 | 21
Debt securities, held-to-maturity, unrecognized gain | 0 | 0
Debt securities, held-to-maturity, unrecognized loss | 0 | 0
Held-to-maturity securities, fair value | 14 | 21
Corporate debt | Available-for-sale securities |  |
Schedule of Investments [Line Items] |  |
Debt securities, available-for-sale, amortized cost | 1,761 | 1,327
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 97 | 37
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | (4) | (1)
Debt securities, available-for-sale, fair value | 1,854 | 1,363
Available-for-sale debt securities | Available-for-sale securities |  |
Schedule of Investments [Line Items] |  |
Debt securities, available-for-sale, amortized cost | 28,137 | 29,967
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 1,104 | 390
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | (16) | (73)
Debt securities, available-for-sale, fair value | 29,225 | 30,284
Accrued interest receivable | 90 | 98
Held-to-maturity securities |  |
Schedule of Investments [Line Items] |  |
Debt securities, held-to-maturity, amortized cost | 1,390 | 1,568
Debt securities, held-to-maturity, unrecognized gain | 86 | 38
Debt securities, held-to-maturity, unrecognized loss | 0 | (6)
Held-to-maturity securities, fair value | 1,476 | 1,600
Accrued interest receivable | 3 | 3
Federal Home Loan Bank certificates and obligations | Held-to-maturity securities |  |
Schedule of Investments [Line Items] |  |
Securities pledged for Federal Home Loan Bank, at fair value | $ 0 | $ 915

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