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, 2017	Dec. 31, 2016
Separate Accounts Disclosure [Abstract]
Variable annuity	$ 71,154	$ 69,606
VUL insurance	6,867	6,659
Other insurance	32	33
Threadneedle investment liabilities	4,116	3,912
Total	$ 82,169	$ 80,210