SCHEDULE II - CONDENSED FINANCIAL INFORMATION OF REGISTRANT (Balance Sheets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Assets
Derivative investments	$ 1,860		$ 881
Other investments	1,709		1,218
Cash and invested cash	3,919		2,364		4,230	4,510
Other assets	2,845		2,730
Total assets	253,377		236,945
Liabilities
Short-term debt	250		501
Long-term debt	5,270		5,320
Payables for collateral on investments	4,409		3,238
Other liabilities	5,776		4,253
Total liabilities	237,637		223,493
Contingencies and Commitments
Stockholders Equity
Preferred stock - 10,000,000 shares authorized; Series A	0		0
Common stock - 800,000,000 shares authorized	6,622		6,876
Retained earnings	6,022		5,013
Accumulated other comprehensive income (loss)	3,096		1,563
Total stockholders' equity	15,740		13,452		14,973
Total Liabilities and Stockholders' Equity	253,377		236,945
Parent Company [Member]
Assets
Investments in subsidiaries	18,488	[1]	15,782	[1]
Derivative investments	298		264
Other investments	5		55
Cash and invested cash	666		1,558		844	622
Loans and accrued interest to subsidiaries	2,495	[1]	2,995	[1]
Other assets	47		54
Total assets	21,999		20,708
Liabilities
Common dividends payable	51		42
Short-term debt	250		501
Long-term debt	5,021		5,571
Loans from subsidiaries	453	[1]	460	[1]
Payables for collateral on investments	96		374
Other liabilities	388		308
Total liabilities	6,259		7,256
Contingencies and Commitments
Stockholders Equity
Preferred stock - 10,000,000 shares authorized; Series A	0		0
Common stock - 800,000,000 shares authorized	6,622		6,876
Retained earnings	6,022		5,013
Accumulated other comprehensive income (loss)	3,096		1,563
Total stockholders' equity	15,740		13,452
Total Liabilities and Stockholders' Equity	$ 21,999		$ 20,708

[1] Eliminated in consolidation.