Reserve for Life-Contingent Contract Benefits and Contractholder Funds (Details 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Contractholder funds activity
Balance, beginning of year	$ 22,529	$ 24,304	$ 39,319
Classified as held for sale, beginning balance	0	10,945	0
Total, including those classified as held for sale	22,529	35,249	39,319
Deposits	1,203	1,333	2,440
Interest credited	760	919	1,295
Benefits	(1,077)	(1,197)	(1,535)
Surrenders and partial withdrawals	(1,278)	(2,273)	(3,299)
Maturities of and interest payments on institutional products	(1)	(2)	(1,799)
Contract charges	(818)	(881)	(1,112)
Net transfers from separate accounts	7	7	12
Other adjustments	(30)	36	(72)
Sold in LBL disposition	0	(10,662)	0
Classified as held for sale, ending balance	0	0	10,945
Balance, end of year	$ 21,295	$ 22,529	$ 24,304