Investments (Unconsolidated Variable Interest Entities) (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Variable Interest Entity [Line Items]
Carrying Amount Asset	$ 85,673	$ 76,597
Carrying Amount Liability	90,884	79,059
Other limited partnership interests
Variable Interest Entity [Line Items]
Carrying Amount Asset	5,978	5,186
Carrying Amount Liability	10,572	7,074
Other invested assets
Variable Interest Entity [Line Items]
Carrying Amount Asset	2,184	1,604
Carrying Amount Liability	2,771	2,161
FVO and trading securities
Variable Interest Entity [Line Items]
Carrying Amount Asset	576	586
Carrying Amount Liability	576	586
Real estate joint ventures
Variable Interest Entity [Line Items]
Carrying Amount Asset	107	65
Carrying Amount Liability	137	82
Other
Variable Interest Entity [Line Items]
Carrying Amount Asset	120	71
Carrying Amount Liability	120	71
Structured securities (RMBS, CMBS, and ABS)
Variable Interest Entity [Line Items]
Carrying Amount Asset	73,334	65,824
Carrying Amount Liability	73,334	65,824
U.S. corporate and foreign corporate securities
Variable Interest Entity [Line Items]
Carrying Amount Asset	3,374	3,261
Carrying Amount Liability	$ 3,374	$ 3,261