Market Risk Benefits (Market Risk Benefits In Asset and Liability Positions) (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024	Dec. 31, 2023
Liability for Future Policy Benefit, Activity [Line Items]
Total MRB assets	$ 2,188	$ 2,331	$ 2,233
Total MRB liabilities	4,859	4,455	4,592
Net liability	2,671		2,359
Individual Retirement Strategies \| Individual Variable
Liability for Future Policy Benefit, Activity [Line Items]
Direct and assumed	1,291		1,441
Ceded	894		780
Total MRB assets	2,185		2,221
Direct and assumed	4,537		4,388
Ceded	117		145
Total MRB liabilities	4,654		4,533
Net liability	2,469		2,312
Individual Retirement Strategies \| Individual Fixed
Liability for Future Policy Benefit, Activity [Line Items]
Direct and assumed	1		0
Ceded	0		0
Total MRB assets	1		0
Direct and assumed	164		0
Ceded	0		0
Total MRB liabilities	164		0
Net liability	163	0	0	$ 0
Other businesses
Liability for Future Policy Benefit, Activity [Line Items]
Direct and assumed	1		11
Ceded	1		1
Total MRB assets	2		12
Direct and assumed	41		59
Ceded	0		0
Total MRB liabilities	41		59
Net liability	39		47
Total
Liability for Future Policy Benefit, Activity [Line Items]
Direct and assumed	1,293		1,452
Ceded	895		781
Total MRB assets	2,188		2,233
Direct and assumed	4,742		4,447
Ceded	117		145
Total MRB liabilities	4,859		4,592
Net liability	2,671		2,359
Total \| Total
Liability for Future Policy Benefit, Activity [Line Items]
Net liability	$ 3,409	$ 2,740	$ 2,947	$ 4,038