Investments (Details 9) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Fair value
Fixed income securities	$ 57,839	$ 57,948
Equity securities	5,666	5,082
Short-term investments	4,288	2,122
Derivative instruments	5	10
Gross unrealized Gains
Fixed income securities	1,710	1,707
Equity securities	594	415
Short-term investments	0	0
Derivative instruments	5	10
Gross unrealized Losses
Fixed income securities	(447)	(960)
Equity securities	(85)	(139)
Short-term investments	0	0
Derivative instruments	(3)	(4)
Unrealized net gains (losses)
Fixed income securities	1,263	747
Equity securities	509	276
Short-term investments	0	0
Derivative instruments	2	6
EMA limited partnerships	(4)	(4)
Unrealized net capital gains and losses, pre-tax	1,770	1,025
Amounts recognized for:
Insurance reserves	0	0
DAC and DSI	(146)	(67)
Amounts recognized	(146)	(67)
Deferred income taxes	(571)	(338)
Total unrealized net capital gains and losses	1,053	620
Fair value of derivative securities classified as assets, with unrealized net gains (losses) in AOCI	$ 5	6
Fair value of derivative securities classified as liabilities, with unrealized net gains (losses) in AOCI		$ (4)