Long-Term Employee Benefits (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 27,243	25,116
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	972
Pre-tax prior service cost/(credit) that will be amortized from accumulated other comprehensive income in next fiscal year	12
Net periodic benefit costs, discount rate	4.32%	5.32%	5.80%
Net periodic benefit costs, expected return on plan assets	8.61%	8.73%	8.64%
Rate of compensation increase	4.18%	4.24%	4.24%
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	107
Pre-tax prior service cost/(credit) that will be amortized from accumulated other comprehensive income in next fiscal year	$ (187)
Net periodic benefit costs, discount rate	4.49%	5.50%	6.00%
Net periodic benefit costs, expected return on plan assets	0.00%	0.00%	0.00%
Rate of compensation increase	4.40%	4.50%	4.50%
U.S. Pension Plan Assumptions [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit costs, discount rate	4.38%	5.50%	6.00%
Net periodic benefit costs, expected return on plan assets	8.96%	9.00%	9.00%
Rate of compensation increase	4.40%	4.50%	4.50%