Policyholder Account Balances, Future Policy Benefits and Claims and Separate Account Liabilities Policyholder Account Balances, Future Policy Benefits and Claims and Separate Account Liabilities (Separate Account Liabilities) (Details 2) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Separate Accounts Disclosure [Abstract]
Variable annuity	$ 69,241	$ 69,333
VUL insurance	6,574	6,637
Other insurance	34	34
Threadneedle investment liabilities	4,333	4,345
Total	$ 80,182	$ 80,349