Business Dispositions and Discontinued Operations - Cash Flows from Discontinued Operations (Details) - Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] - Life and Annuity Run-Off Business $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net cash provided by operating activities from discontinued operations	$ 603
Net cash provided by investing activities from discontinued operations	463
Net cash used in financing activities from discontinued operations	(737)
Return to capital to parent	$ 619