Operating Segments, Geographic Analysis and Major Customers (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Operating segments, geographical analysis and major customers
Long-lived assets	$ 21,707	$ 20,880
U.S.
Operating segments, geographical analysis and major customers
Long-lived assets	6,996	7,395
Norway
Operating segments, geographical analysis and major customers
Long-lived assets	2,091	2,072
Brazil
Operating segments, geographical analysis and major customers
Long-lived assets	1,388	2,285
Other countries
Operating segments, geographical analysis and major customers
Long-lived assets	11,232	9,128
Switzerland
Operating segments, geographical analysis and major customers
Long-lived assets	$ 6	$ 7