Employee Benefits (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule of Defined Benefit Plans Disclosures (Textual) [Abstract]
Defined benefit plan, net periodic benefit cost expected in next fiscal year	$ 7
Employee Benefits (Textual) [Abstract]
Measurement date	31st December
Pre- tax AOCI not yet recognized as net pension cost	634	525
Maximum limit for vary of market related value	10.00%
Percentage increase or decrease in expected return on plan assets	0.25%
Estimated increase or decrease in net pension cost	2
Percentage increase or decrease in assumed discount rate	0.25%
Estimated change in net pension cost due to discount rate	1
Expected return on plan assets	7.75%	8.25%	8.25%
Expected return on plan assets on estimating 2012 pension cost	7.25%
Defined benefit plan net pension cost increase in 2012 year	5
Weighted-average discount rates to determine APBO	4.00%	4.75%
Employees minimum contribution to Saving Plan	1.00%
Employees maximum contribution to Saving Plan	25.00%
Employer contribution to Saving Plan	6.00%
Total expenses associated with Saving Plan	79	75	44
Profit sharing allocation	3.00%	3.00%	3.00%
Accumulated benefit obligation for all pension plans	1,200	1,200
Pension Plans, Defined Benefit [Member]
Schedule of Defined Benefit Plans Disclosures (Textual) [Abstract]
Pre-tax accumulated other comprehensive loss expected to be recognized as net pension cost	16
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2012	108
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2013	104
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2014	98
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2015	93
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2016	90
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2017 through 2020	404
Percentage decrease in assumed expected return on assets	0.50%
Measurement date	31st December	31st December
Employee Benefits (Textual) [Abstract]
Weighted-average discount rates to determine APBO	4.00%	4.75%
Accumulated benefit obligation for all pension plans	1,225	1,248
Other Postretirement Benefit Plans, Defined Benefit [Member]
Schedule of Defined Benefit Plans Disclosures (Textual) [Abstract]
Pre-tax accumulated other comprehensive loss expected to be recognized as net pension cost	1
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2012	6
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2013	6
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2014	6
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2015	6
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2016	6
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2017 through 2020	27
Expected net periodic benefit cost for next fiscal year	Less than $1 million
Defined benefit plan net periodic benefit costs	Less than $1 million	Less than $1 million
Measurement date	31st December	31st December
Employee Benefits (Textual) [Abstract]
Pre- tax AOCI not yet recognized as net pension cost	$ 0	$ (9)