Related Party Transactions (Service Agreements - Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017	Sep. 30, 2017	Sep. 30, 2016
Related Party Transaction [Line Items]
Other expenses	$ 22	$ 25		$ 71	$ 74
Universal life and investment-type product policy fees	1,025	976		2,935	2,843
Other revenues	93	49		329	481
Percentage of deferred tax asset related to an agreement previously recorded			86.00%
Income Tax Expense (Benefit)	819	(94)		653	(754)
Affiliated Entity
Related Party Transaction [Line Items]
Interest Expense, Debt	0	32		55	94
Other expenses	$ 101	$ 190		$ 296	$ 686
Spinoff
Related Party Transaction [Line Items]
Due to Affiliate			$ 553
Income Tax Expense (Benefit)			$ 643