Investments (Fixed Maturity and Equity Securities Available-For-Sale - Narrative) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Dec. 31, 2012
Summary of Certain Fixed Maturity Securities
Gross Unrealized OTTI Loss	$ 105	$ 218	$ 361
Available-for-sale Securities, Debt Securities	368,070	350,187
Foreign corporate securities [Member]
Summary of Certain Fixed Maturity Securities
Gross Unrealized OTTI Loss	7	0
Available-for-sale Securities, Debt Securities	61,877	63,152
Gross Unrealized Gain	4,477	3,939
Non-income producing fixed maturity securities [Member]
Summary of Certain Fixed Maturity Securities
Available-for-sale Securities, Debt Securities	96	74
Gross Unrealized Gain	$ 52	$ 23