Investments and Derivative Instruments Level 4 Equity Method Investments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	$ 2,900
Outstanding Commitments to Fund Limited Partnership and Other Alternative Investments	$ 748
Aggregate Investment Loss Percentage of Company's Pre Tax Consolidated Net Income Minimum	10.00%
Assets	$ 228,348	$ 245,013
Liabilities	210,706	226,293
Net Investment Income	3,030	3,154	$ 3,264
Net Income (Loss) Attributable to Parent	1,682	798	176
Limited Partner [Member]
Schedule of Equity Method Investments [Line Items]
Assets	95,500	85,800
Liabilities	15,200	10,600
Net Investment Income	1,000	3,600	1,800
Net Income (Loss) Attributable to Parent	$ 6,300	$ 9,600	$ 8,400