Discontinued Operations (Income Statement Data) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations, net of tax	$ 0	$ 0	$ 0
Disposals of discontinued operations	0	(5)	42
Income tax (credit) expense	0	(5)	16
Disposals of discontinued operations, net of tax	0	0	26
Discontinued operations, net of tax	$ 0	$ 0	$ 26
Discontinued operations, net of tax per share
- Basic (in dollars per share)	$ 0.00	$ 0.00	$ 0.05
- Diluted (in dollars per share)	$ 0.00	$ 0.00	$ 0.04
Putnam
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) related to settlement of indemnity agreement, net of tax			$ 28