Condensed Financial Information (Parent Company) (Condensed Balance Sheet - Parenthetical) (Details) - USD ($) $ / shares in Units, $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Condensed Balance Sheet Statements, Captions [Line Items]
Amortized cost of fixed maturity securities	$ 297,655	$ 286,816
Preferred stock, par value	$ 0.01	$ 0.01
Preferred Stock, aggregate liquidation preference	$ 3,405	$ 3,405
Common stock, par value	$ 0.01	$ 0.01
Common Stock, shares authorized	3,000,000,000	3,000,000,000
Common stock, shares issued	1,177,680,299	1,171,824,242
Common stock, shares outstanding	915,338,098	958,613,542
Treasury stock, shares	262,342,201	213,210,700
Parent Company
Condensed Balance Sheet Statements, Captions [Line Items]
Amortized cost of fixed maturity securities	$ 3,062	$ 2,745
Preferred stock, par value	$ 0.01	$ 0.01
Preferred Stock, aggregate liquidation preference	$ 3,405	$ 3,405
Common stock, par value	$ 0.01	$ 0.01
Common Stock, shares authorized	3,000,000,000	3,000,000,000
Common stock, shares issued	1,177,680,299	1,171,824,242
Common stock, shares outstanding	915,338,098	958,613,542
Treasury stock, shares	262,342,201	213,210,700