Insurance (Fund Groupings) (Details) - Variable Annuity and Variable Life - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Separate Account Investment [Line Items]
Fund Groupings	$ 101,653	$ 93,741
Balanced
Fair Value, Separate Account Investment [Line Items]
Fund Groupings	64,134	60,040
Equity
Fair Value, Separate Account Investment [Line Items]
Fund Groupings	29,036	25,344
Bond
Fair Value, Separate Account Investment [Line Items]
Fund Groupings	8,467	8,339
Money Market
Fair Value, Separate Account Investment [Line Items]
Fund Groupings	$ 16	$ 18