Investments (Unconsolidated Variable Interest Entities) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Variable Interest Entity [Line Items]
Carrying Amount Asset	$ 86,625	$ 76,597
Carrying Amount Liability	91,474	79,059
Other limited partnership interests
Variable Interest Entity [Line Items]
Carrying Amount Asset	6,267	5,186
Carrying Amount Liability	10,470	7,074
Other invested assets
Variable Interest Entity [Line Items]
Carrying Amount Asset	2,131	1,604
Carrying Amount Liability	2,747	2,161
FVO and trading securities
Variable Interest Entity [Line Items]
Carrying Amount Asset	546	586
Carrying Amount Liability	546	586
Real estate joint ventures
Variable Interest Entity [Line Items]
Carrying Amount Asset	118	65
Carrying Amount Liability	148	82
Other
Variable Interest Entity [Line Items]
Carrying Amount Asset	117	71
Carrying Amount Liability	117	71
Structured securities (RMBS, CMBS, and ABS)
Variable Interest Entity [Line Items]
Carrying Amount Asset	74,273	65,824
Carrying Amount Liability	74,273	65,824
U.S. corporate and foreign corporate securities
Variable Interest Entity [Line Items]
Carrying Amount Asset	3,173	3,261
Carrying Amount Liability	$ 3,173	$ 3,261