Financing Receivables Financing Receivables (Credit Quality Information Tables) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items]
Financing Receivable, Gross	$ 3,727	$ 3,711
Less: allowance for loan losses	26	28	30	30
Commercial Mortgage Loans
Mortgage Loans on Real Estate [Line Items]
Financing Receivable, Gross	2,594	2,564
Less: allowance for loan losses	23	24
Total loans	2,571	2,540
Percent of Loans	100.00%	100.00%
Commercial Mortgage Loans | Retail
Mortgage Loans on Real Estate [Line Items]
Financing Receivable, Gross	933	917
Percent of Loans	36.00%	36.00%
Commercial Mortgage Loans | Office
Mortgage Loans on Real Estate [Line Items]
Financing Receivable, Gross	552	548
Percent of Loans	21.00%	21.00%
Commercial Mortgage Loans | Industrial
Mortgage Loans on Real Estate [Line Items]
Financing Receivable, Gross	455	431
Percent of Loans	18.00%	17.00%
Commercial Mortgage Loans | Apartments
Mortgage Loans on Real Estate [Line Items]
Financing Receivable, Gross	432	454
Percent of Loans	17.00%	18.00%
Commercial Mortgage Loans | Mixed Use
Mortgage Loans on Real Estate [Line Items]
Financing Receivable, Gross	45	36
Percent of Loans	2.00%	1.00%
Commercial Mortgage Loans | Hotel
Mortgage Loans on Real Estate [Line Items]
Financing Receivable, Gross	34	32
Percent of Loans	1.00%	1.00%
Commercial Mortgage Loans | Other
Mortgage Loans on Real Estate [Line Items]
Financing Receivable, Gross	143	146
Percent of Loans	5.00%	6.00%
Commercial Mortgage Loans | South Atlantic [Member]
Mortgage Loans on Real Estate [Line Items]
Financing Receivable, Gross	706	679
Percent of Loans	27.00%	26.00%
Commercial Mortgage Loans | Pacific
Mortgage Loans on Real Estate [Line Items]
Financing Receivable, Gross	642	631
Percent of Loans	25.00%	25.00%
Commercial Mortgage Loans | Mountain
Mortgage Loans on Real Estate [Line Items]
Financing Receivable, Gross	253	248
Percent of Loans	10.00%	10.00%
Commercial Mortgage Loans | East North Central
Mortgage Loans on Real Estate [Line Items]
Financing Receivable, Gross	236	248
Percent of Loans	9.00%	10.00%
Commercial Mortgage Loans | Middle Atlantic
Mortgage Loans on Real Estate [Line Items]
Financing Receivable, Gross	213	202
Percent of Loans	8.00%	8.00%
Commercial Mortgage Loans | West North Central
Mortgage Loans on Real Estate [Line Items]
Financing Receivable, Gross	199	194
Percent of Loans	8.00%	7.00%
Commercial Mortgage Loans | West South Central
Mortgage Loans on Real Estate [Line Items]
Financing Receivable, Gross	148	153
Percent of Loans	6.00%	6.00%
Commercial Mortgage Loans | New England
Mortgage Loans on Real Estate [Line Items]
Financing Receivable, Gross	132	138
Percent of Loans	5.00%	5.00%
Commercial Mortgage Loans | East South Central
Mortgage Loans on Real Estate [Line Items]
Financing Receivable, Gross	$ 65	$ 71
Percent of Loans	2.00%	3.00%