Long-Term Employee Benefits (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	25,116	22,165
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit costs, discount rate	5.50%	6.00%	6.25%
Net periodic benefit costs, expected return on plan assets	9.00%	9.00%	9.00%
Rate of compensation increase	4.50%	4.50%	4.50%
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pre-tax net loss that will be amortized from accumulated other comprehensive income in next fiscal year	877
Pre-tax prior service cost/(credit) that will be amortized from accumulated other comprehensive income in next fiscal year	16
Other Long-Term Employee Benefit Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pre-tax net loss that will be amortized from accumulated other comprehensive income in next fiscal year	(88)
Pre-tax prior service cost/(credit) that will be amortized from accumulated other comprehensive income in next fiscal year	(121)