Other Expenses (Restructuring Charges) (Details) (Other Expenses [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Restructuring Charges
Balance, beginning of period	$ 23	$ 0
Restructuring charges	115	159
Cash payments	(92)	(136)
Balance, end of period	46	23
Total restructuring charges incurred since inception of initiative	274	159
Severance [Member]
Restructuring Charges
Balance, beginning of period	23	0
Restructuring charges	99	141
Cash payments	(82)	(118)
Balance, end of period	40	23
Total restructuring charges incurred since inception of initiative	240	141
Lease and Asset Impairment [Member]
Restructuring Charges
Balance, beginning of period	0	0
Restructuring charges	16	18
Cash payments	(10)	(18)
Balance, end of period	6	0
Total restructuring charges incurred since inception of initiative	$ 34	$ 18