Business and Basis of Presentation (Transition Adjustment Roll Forward Of Retained Earnings) (Details) - Retained Earnings $ in Millions	Jan. 01, 2021 USD ($)
Retained Earnings Transition Adjustment [Roll Forward]
Balance after-tax, after transition	$ 28,137
As Previously Reported
Retained Earnings Transition Adjustment [Roll Forward]
Balance after-tax, prior to transition	30,749
Effect of Change
Retained Earnings Transition Adjustment [Roll Forward]
Reclassification of market risk benefits non-performance risk to AOCI	(1,588)
Updates to certain universal life contract liabilities	(1,025)
Change in non-participating traditional and limited-pay contract liabilities	(543)
Other	(271)
Total pre-tax adjustments	(3,427)
Tax impacts	$ 815