Benefit Plans (Amounts Recognized in the Consolidated Balance Sheets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
AMOUNTS RECOGNIZED ON THE CONSOLIDATED BALANCE SHEETS
Accrued benefit liability—noncurrent	$ (1,310)	$ (2,418)
U.S. Defined Benefit Plans
AMOUNTS RECOGNIZED ON THE CONSOLIDATED BALANCE SHEETS
Noncurrent assets	0	0
Accrued benefit liability—current	0	0
Accrued benefit liability—noncurrent	(118)	(327)
Net amount recognized at end of year	(118)	(327)
Foreign Defined Benefit Plans
AMOUNTS RECOGNIZED ON THE CONSOLIDATED BALANCE SHEETS
Noncurrent assets	23	0
Accrued benefit liability—current	(4)	(3)
Accrued benefit liability—noncurrent	(1,163)	(2,053)
Net amount recognized at end of year	$ (1,144)	$ (2,056)