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	$ 49,793	$ 46,453
Equity
Fair Value, Separate Account Investment [Line Items]
Fund Groupings	25,097	22,450
Balanced
Fair Value, Separate Account Investment [Line Items]
Fund Groupings	19,014	18,332
Bond
Fair Value, Separate Account Investment [Line Items]
Fund Groupings	5,565	5,537
Money Market
Fair Value, Separate Account Investment [Line Items]
Fund Groupings	$ 117	134
Restatement Adjustment
Fair Value, Separate Account Investment [Line Items]
Fund Groupings		4,200
Restatement Adjustment | Equity
Fair Value, Separate Account Investment [Line Items]
Fund Groupings		2,900
Restatement Adjustment | Balanced
Fair Value, Separate Account Investment [Line Items]
Fund Groupings		$ 1,300