Business Held for Sale and Discontinued Operations - Held for Sale Cash Flows Statement (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net cash provided by operating activities - discontinued operations	$ (102)	$ 1,052	$ 511
Net cash provided by investing activities - discontinued operations	(626)	(214)	(2,261)
Net cash provided by financing activities - discontinued operations	813	(672)	1,271
Held for sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net cash provided by operating activities - discontinued operations	(102)	1,052	511
Net cash provided by investing activities - discontinued operations	(626)	(214)	(2,261)
Net cash provided by financing activities - discontinued operations	813	(672)	1,271
Individual Life Transaction | Held for sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net cash provided by operating activities - discontinued operations	(102)	(410)	100
Net cash provided by investing activities - discontinued operations	(498)	(248)	(1,000)
Net cash provided by financing activities - discontinued operations	813	537	887
2018 Transaction | Held for sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net cash provided by operating activities - discontinued operations	0	1,462	411
Net cash provided by investing activities - discontinued operations	(128)	34	(1,261)
Net cash provided by financing activities - discontinued operations	$ 0	$ (1,209)	$ 384