Commitments, Contingencies, And Guarantees (Amounts Of Obligations) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Commitments And Contingencies [Line Items]
Total	$ 7,727
Less than 1 year	1,014
1 to 2 years	725
2 to 3 years	467
3 to 4 years	350
5 years and thereafter	5,171
Other accrued liabilities	41
Total debt	3,382		2,364
Uncertain tax positions, related	6
Performance Bonds And Guarantees [Member]
Commitments And Contingencies [Line Items]
Total	35
Less than 1 year	22
1 to 2 years	3
2 to 3 years	5
5 years and thereafter	5
Credit Facilities For Equity Companies [Member]
Commitments And Contingencies [Line Items]
Total	50
Less than 1 year	25
1 to 2 years	25
Stand-By Letters Of Credit [Member]
Commitments And Contingencies [Line Items]
Total	57	[1]
Less than 1 year	57	[1]
Commitment Expirations [Member]
Commitments And Contingencies [Line Items]
Total	142
Less than 1 year	104
1 to 2 years	28
2 to 3 years	5
5 years and thereafter	5
Purchase Obligations [Member]
Commitments And Contingencies [Line Items]
Total	89
Less than 1 year	37
1 to 2 years	21
2 to 3 years	11
3 to 4 years	9
5 years and thereafter	11
Capital Expenditure Obligations [Member]
Commitments And Contingencies [Line Items]
Total	240	[2]
Less than 1 year	240	[2]
Total Debt [Member]
Commitments And Contingencies [Line Items]
Total	3,214	[3]
Less than 1 year	73	[3]
1 to 2 years	295	[3]
2 to 3 years	136	[3]
3 to 4 years	154	[3]
5 years and thereafter	2,556	[3]
Interest On Long-Term Debt [Member]
Commitments And Contingencies [Line Items]
Total	2,853	[4]
Less than 1 year	160	[4]
1 to 2 years	165	[4]
2 to 3 years	151	[4]
3 to 4 years	144	[4]
5 years and thereafter	2,233	[4]
Minimum Rental Commitments [Member]
Commitments And Contingencies [Line Items]
Total	834
Less than 1 year	383
1 to 2 years	200
2 to 3 years	149
3 to 4 years	28
5 years and thereafter	74
Capital Leases [Member]
Commitments And Contingencies [Line Items]
Total	216	[3]
Less than 1 year	3	[3]
1 to 2 years	2	[3]
2 to 3 years	3	[3]
3 to 4 years	3	[3]
5 years and thereafter	205	[3]
Imputed Interest On Capital Leases [Member]
Commitments And Contingencies [Line Items]
Total	135
Less than 1 year	12
1 to 2 years	12
2 to 3 years	12
3 to 4 years	12
5 years and thereafter	87
Uncertain Tax Positions [Member]
Commitments And Contingencies [Line Items]
Total	4	[5]
Less than 1 year	2	[5]
1 to 2 years	2	[5]
Contractual Obligation Payments [Member]
Commitments And Contingencies [Line Items]
Total	7,585
Less than 1 year	910
1 to 2 years	697
2 to 3 years	462
3 to 4 years	350
5 years and thereafter	5,166
Scenario, Uncertain Estimate [Member]
Commitments And Contingencies [Line Items]
Uncertain tax positions, related	$ 2

[1] At December 31, 2012, $41 million of the $57 million was included in other accrued liabilities on our consolidated balance

[2] Capital expenditure obligations primarily reflect amounts associated with our capital expansion activities

[3] At December 31, 2012, $3.4 billion was included on our balance sheet. Total debt above is stated at maturity value

[4] The estimate of interest payments assumes interest is paid through the date of maturity or expiration of the related debt, based upon stated rates in the respective debt instruments

[5] At December 31, 2012, $6 million was included on our balance sheet related to uncertain tax positions. Of this amount, we are unable to estimate when $2 million of that amount will become payable