Deferred Policy Acquisition Costs and Present Value of Future Profits Level 4 (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Movement Analysis of Deferred Policy Acquisition Costs and Present Value of Future Profits [Roll Forward]
Balance, beginning of period	$ 1,823	$ 2,161	$ 5,725
Deferred Policy Acquisition Costs and Present Value of Future Profits, Additions	1,390	1,364	1,330
Deferred Policy Acquisition Cost, Amortization Expense	(1,571)	(1,593)	(1,615)
Deferred Policy Acquisition Cost, Amortization Expense, Effect of Adjustments to Estimated Gross Profit	69	(136)	(1,086)
Adjustments to unrealized gains and losses on securities available-for-sale and other	(105)	(27)	(122)
Effect of currency translation	0	0	86
Balance, end of period	1,816	1,823	2,161
Retirement Plans and Individual Life Businesses [Member]
Movement Analysis of Deferred Policy Acquisition Costs and Present Value of Future Profits [Roll Forward]
Deferred Policy Acquisition Cost, Amortization Expense	$ 0	$ 0	(2,229)
Retirement Plans [Member]
Movement Analysis of Deferred Policy Acquisition Costs and Present Value of Future Profits [Roll Forward]
Adjustments to unrealized gains and losses on securities available-for-sale and other			148
Deferred Policy Acquisition Costs, Period Increase (Decrease)			352
Individual Life [Member]
Movement Analysis of Deferred Policy Acquisition Costs and Present Value of Future Profits [Roll Forward]
Adjustments to unrealized gains and losses on securities available-for-sale and other			349
Deferred Policy Acquisition Costs, Period Increase (Decrease)			2,374
Variable Annuity [Member]
Movement Analysis of Deferred Policy Acquisition Costs and Present Value of Future Profits [Roll Forward]
Deferred Policy Acquisition Cost, Amortization Expense, Effect of Adjustments to Estimated Gross Profit			$ (887)