Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	$ 105,177,000,000	$ 104,174,000,000
Allowance for Credit Losses	19,000,000	13,000,000
Fair Value	118,746,000,000	123,044,000,000
Fixed Maturity AFS Securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	105,177,000,000	104,174,000,000
Gross unrealized gains	14,039,000,000	19,081,000,000
Gross unrealized losses	451,000,000	198,000,000
Allowance for Credit Losses	19,000,000	13,000,000
Fair Value	118,746,000,000	123,044,000,000
Fixed Maturity AFS Securities [Member] | Corporate Bonds [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	86,373,000,000	86,289,000,000
Gross unrealized gains	12,113,000,000	16,662,000,000
Gross unrealized losses	349,000,000	150,000,000
Allowance for Credit Losses	17,000,000	12,000,000
Fair Value	98,120,000,000	102,789,000,000
Fixed Maturity AFS Securities [Member] | U.S. Government Bonds [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	375,000,000	397,000,000
Gross unrealized gains	60,000,000	88,000,000
Gross unrealized losses	2,000,000	1,000,000
Fair Value	433,000,000	484,000,000
Fixed Maturity AFS Securities [Member] | State And Municipal Bonds [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	5,322,000,000	5,360,000,000
Gross unrealized gains	1,311,000,000	1,561,000,000
Gross unrealized losses	12,000,000
Fair Value	6,621,000,000	6,921,000,000
Fixed Maturity AFS Securities [Member] | Foreign Government Bonds [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	373,000,000	384,000,000
Gross unrealized gains	64,000,000	87,000,000
Gross unrealized losses	5,000,000	1,000,000
Fair Value	432,000,000	470,000,000
Fixed Maturity AFS Securities [Member] | RMBS [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	2,334,000,000	2,765,000,000
Gross unrealized gains	196,000,000	313,000,000
Gross unrealized losses	4,000,000	1,000,000
Allowance for Credit Losses	1,000,000	1,000,000
Fair Value	2,525,000,000	3,076,000,000
Fixed Maturity AFS Securities [Member] | CMBS [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	1,552,000,000	1,390,000,000
Gross unrealized gains	61,000,000	115,000,000
Gross unrealized losses	14,000,000
Fair Value	1,599,000,000	1,505,000,000
Fixed Maturity AFS Securities [Member] | ABS [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	8,439,000,000	7,041,000,000
Gross unrealized gains	127,000,000	158,000,000
Gross unrealized losses	54,000,000	15,000,000
Fair Value	8,512,000,000	7,184,000,000
Fixed Maturity AFS Securities [Member] | Hybrid And Redeemable Preferred Securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	409,000,000	548,000,000
Gross unrealized gains	107,000,000	97,000,000
Gross unrealized losses	11,000,000	30,000,000
Allowance for Credit Losses	1,000,000
Fair Value	$ 504,000,000	$ 615,000,000