Segment Information Schedule of consolidated non-current assets by geographic area (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 13,728	$ 13,819
UNITED STATES [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	7,720	8,355
Europe, Middle East and Africa [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	2,440	2,462
Americas other than U.S. [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	559	599
UNITED KINGDOM [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	2,392	1,721
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 617	$ 682