Investments - Unrealized Losses on AFS Securities (Details) $ in Millions	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	4,936
Percentage of Gross Unrealized Losses Depressed Less than Twenty Percent of Cost or Amortized Cost	91.00%
ABS
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 1,577	$ 396
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(50)	(3)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	281	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(25)	0
Debt Securities, Available-for-sale, Unrealized Loss Position	1,858	396
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(75)	(3)
CLO
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	1,490	1,434
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(48)	(2)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,378	147
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(54)	0
Debt Securities, Available-for-sale, Unrealized Loss Position	2,868	1,581
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(102)	(2)
CMBS
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	2,560	594
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(270)	(7)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	521	82
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(88)	(8)
Debt Securities, Available-for-sale, Unrealized Loss Position	3,081	676
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(358)	(15)
Corporate
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	11,157	3,698
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1,071)	(65)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	2,575	234
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(521)	(9)
Debt Securities, Available-for-sale, Unrealized Loss Position	13,732	3,932
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(1,592)	(74)
Foreign government/government agencies
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	308	340
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(26)	(5)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	224	16
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(23)	(1)
Debt Securities, Available-for-sale, Unrealized Loss Position	532	356
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(49)	(6)
Municipal
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	4,270	301
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(461)	(3)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	228	12
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(54)	0
Debt Securities, Available-for-sale, Unrealized Loss Position	4,498	313
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(515)	(3)
Residential mortgage-backed securities ("RMBS")
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	2,311	1,869
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(249)	(23)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,250	94
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(259)	(4)
Debt Securities, Available-for-sale, Unrealized Loss Position	3,561	1,963
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(508)	(27)
U.S. Treasuries
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	1,554	2,301
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(145)	(13)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	633	23
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(98)	(1)
Debt Securities, Available-for-sale, Unrealized Loss Position	2,187	2,324
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(243)	(14)
Securities available-for-sale and other
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	25,227	10,933
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(2,320)	(121)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	7,090	608
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1,122)	(23)
Debt Securities, Available-for-sale, Unrealized Loss Position	32,317	11,541
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (3,442)	$ (144)

Percentage of gross unrealized losses depressed less than twenty percent of cost or amortized cost.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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