Schedule II - Condensed Financial Information, Notes (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Maturities of debt:
Long-term debt maturities in 2015	$ 0
Long-term debt maturities in 2016	600
Long-term debt maturities in 2017	250
Long-term debt maturities in 2018	131
Long-term debt maturities in 2019	251
Long-term debt maturities after 2019	3,653
Notes To Condensed Statements Details [Abstract]
Interest expense on long-term and short-term debt	265	270	268
Interest paid on long-term and short-term debt	259	265	248
Parent Company [Member]
Notes To Condensed Statements Details [Abstract]
Interest expense on long-term and short-term debt	258	264	262
Interest paid on long-term and short-term debt	252	259	242
Intercompany liabilities consisting primarily of loans payable	1,138	1,043
Average Interest Rate On Intercompany Loan	0.52%	0.59%
Bank letter of credit to provide collateral for subsidiary	4
Payment guarantee on surety bonds obtained by subsidiaries	79
Letter of credit required by insurer of high-deductible self-insurance program	6
Solvency guarantee required by regulators for Insurance subsidiaries	34
Bank letter of credit arranged for subsidiary	13
Guarantee on reserve related to assumed reinsurance business of subsidiary	22
Parent Company [Member] | Cigna Holdings, Inc. [Member]
Notes To Condensed Statements Details [Abstract]
Intercompany liabilities consisting primarily of loans payable	$ 877	$ 1,043