Business Held for Sale and Discontinued Operations - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) subsidiary	Dec. 31, 2016 USD ($) subsidiary	Dec. 31, 2015 USD ($)	Dec. 20, 2017 subsidiary
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of insurance subsidiaries | subsidiary	4	4
VIAC and DSL | Held for sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of insurance subsidiaries | subsidiary				2
Notes payable	$ 350
Equity interest in VA Capital	9.99%
Termination fee payable for termination of master transaction agreement	$ 105
Loss on sale, net of Tax	(2,423)	$ 0	$ 0
Transaction costs due to Discontinued Operations	31
Loss on Deferred Tax Assets due to Sale	$ 692