Schedule V - Valuation and Qualifying Accounts and Reserves (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for Loans and Leases Receivable [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period		$ 12	$ 8	$ 7
Charged (Credited) to costs and expenses		7	4	4
Charged (Credited) to other accounts		0	0	0
Other deductions	[1]	(4)	0	(3)
Balance at end of period		15	12	8
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period		101	43	51
Charged (Credited) to costs and expenses		(10)	53	0
Charged (Credited) to other accounts		(15)	5	(2)
Other deductions		(1)	0	(6)
Balance at end of period		75	101	43
Valuation Allowance of Deferred Tax Assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period		49	49	42
Charged (Credited) to costs and expenses		8	21	7
Charged (Credited) to other accounts		14	(21)	0
Other deductions		0	0	0
Balance at end of period		71	49	49
Allowance for Reinsurance Recoverable [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period		4	4	4
Charged (Credited) to costs and expenses		0	0	0
Charged (Credited) to other accounts		(1)	0	0
Other deductions		0	0	0
Balance at end of period		$ 3	$ 4	$ 4

[1] Amounts for commercial mortgage loans primarily reflect charge-offs upon sales and repayments, as well as transfers to foreclosed real estate.