Goodwill and Other Intangible Assets and Liablities Schedule of Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Line Items]
Goodwill, Impairment Loss	$ 0	$ 0	$ 0
Goodwill, Impaired, Accumulated Impairment Loss	0	0
Goodwill [Roll Forward]
Goodwill, Beginning Balance	14,819	14,819
Goodwill, Acquired During Period	26	0
Goodwill, Ending Balance	$ 14,845	$ 14,819	$ 14,819