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Fair Value (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Fair Value (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Fair Value Disclosures [Abstract]
Fair Value, Assets, Level 2 to Level 1, Transfers	$ 10	$ 0	$ 10	$ 24
Fair Value, Assets, Level 1 to Level 2, Transfers	$ 0	$ 0	$ 0	$ 1