Integration and Restructuring Costs (Restructuring Activities) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restructuring Reserve [Roll Forward]
Liability at beginning of period	$ 124	$ 170	$ 181
Expense Incurred	12	22	78
Cash Paid	(43)	(65)	(88)
Other	(1)	(3)
Liability at end of period	92	124	170
Severance [Member]
Restructuring Reserve [Roll Forward]
Liability at beginning of period	11	36
Expense Incurred	4	9
Cash Paid	(8)	(33)
Other		(1)
Liability at end of period	7	11
Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Liability at beginning of period	113	134
Expense Incurred	8	13
Cash Paid	(35)	(32)
Other	(1)	(2)
Liability at end of period	$ 85	$ 113