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Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
integer
Dec. 31, 2011
Dec. 31, 2010
Defined Contribution Plan [Abstract]      
Defined Contribution Plan Contributions $ 21 $ 22 $ 22
Definted Benefit Plan General Disclosures [Abstract]      
Defined Benefit Plan Number Of Plans Disclosure 31    
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]      
Accrued benefit liability - long-term 2,456 1,729  
Defined Benefit Plan Assumptions Sensitivity To Changes [Abstract]      
Increase of 1% in the discount rate (48)    
Decrease of 1% in the discount rate 38    
Increase of 1% in the long-term rate of return on plan assets (47)    
Decrease of 1% in the long-term rate of return on plan assets 47    
U.S. [Member]
     
Definted Benefit Plan General Disclosures [Abstract]      
Defined Benefit Plan Number Of Plans Disclosure 5    
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 1,044 608  
Service cost 14 8 7
Interest cost 48 33 32
Employee contributions 0 0  
Plan amendments 7 0  
Plan curtailments 0 0  
Plan settlements (1) 0  
Benefits paid (51) (30)  
Business combinations 0 365  
Assumption Of A Plan Due To Resolution Of Bankruptcy Proceedings 51 0  
Actuarial loss 98 60  
Effect of foreign currency exchange rate change 0 0  
Benefit obligation as of December 31 1,210 1,044 608
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets at beginning of year 762 413  
Actual return on plan assets 97 6  
Employer contributions 49 37  
Employee contributions 0 0  
Plan settlements (1) 0  
Benefits paid (51) (30)  
Business combinations 0 336  
Assumption Of A Plan Due To Resolution Of Bankruptcy Proceedings 27 0  
Effect of foreign currency exchange rate change 0 0  
Fair value of plan assets as of December 31 883 762 413
Defined Benefit Plan, Funded Status of Plan [Abstract]      
Funded status as of December 31 (327) (282)  
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]      
Noncurrent assets 0 0  
Accrued benefit liability - current 0 1  
Accrued benefit liability - long-term 327 281  
Net amount recognized at end of year (327) (282)  
Accumulated Benefit Obligation Disclosure [Abstract]      
Accumulated Benefit Obligation 1,180 1,020  
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]      
Projected benefit obligation 1,210 1,044  
Accumulated benefit obligation 1,180 1,020  
Fair value of plan assets 883 762  
Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets [Abstract]      
Projected benefit obligation 1,210 1,044  
Fair value of plan assets 883 762  
Funded status as of December 31 (327) (282)  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]      
Discount rates 3.86% 4.67%  
Rates of compensation increase 3.94% 3.94%  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]      
Discount rate 4.67% 5.38%  
Expected long-term rate of return on plan assets 7.28% 7.49%  
Rate of compensation increase 3.94% 3.94%  
Defined Benefit Plan, Assumptions Used in Calculations [Abstract]      
Defined Benefit Plan Benefit Obligation Subsidiary Using Salary Bands 764 679  
Defined Benefit Plan Net Periodic Benefit Cost Abstract      
Service cost 14 8 7
Interest cost 48 33 32
Expected return on plan assets (55) (33) (30)
Amortization of initial net asset 0 0 0
Amortization of prior service cost 4 4 3
Amortization of net loss (19) (13) (12)
Loss on curtailment 0 0 0
Settlement gain recognized 0 0 0
Total pension cost 30 25 24
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]      
Prior service cost 0    
Unrecognized net actuarial loss 0    
Total 0    
Defined Benefit Plan Amounts That Will Be Amortized From Accumulated Other Comprehensive Income Loss In Next Fiscal Year [Abstract]      
Prior service cost 0    
Total 0    
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Actual Plan Asset Allocations 100.00% 100.00%  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 883 762 413
Defined Benefit Plan, Estimated Future Employer Contributions [Abstract]      
Expected employer contribution in 2013 53    
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]      
2013 58    
2014 60    
2015 62    
2016 64    
2017 66    
2018 - 2022 354    
U.S. [Member] | Level 1
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 629 541  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 629 541  
U.S. [Member] | Level 2
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 254 221  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 254 221  
U.S. [Member] | Level 3
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 0  
U.S. [Member] | Equity Securities Common Stock [Member]
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets at beginning of year 120    
Fair value of plan assets as of December 31 134    
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Target Plan Asset Allocations 41.00%    
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Actual Plan Asset Allocations 32.28% 34.12%  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 134    
U.S. [Member] | Equity Securities Common Stock [Member] | Level 1
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 134 120  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 134 120  
U.S. [Member] | Equity Securities Common Stock [Member] | Level 2
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 0  
U.S. [Member] | Equity Securities Common Stock [Member] | Level 3
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 0  
U.S. [Member] | Equity securities Mutual funds [Member]
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 151 140  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 151 140  
U.S. [Member] | Equity securities Mutual funds [Member] | Level 1
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 151 140  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 151 140  
U.S. [Member] | Equity securities Mutual funds [Member] | Level 2
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 0  
U.S. [Member] | Equity securities Mutual funds [Member] | Level 3
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 0  
U.S. [Member] | U.S. Government debt securities [Member]
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 32 31  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 32 31  
U.S. [Member] | U.S. Government debt securities [Member] | Level 1
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 32 31  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 32 31  
U.S. [Member] | U.S. Government debt securities [Member] | Level 2
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 0  
U.S. [Member] | U.S. Government debt securities [Member] | Level 3
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 0  
U.S. [Member] | Corporate Debt Securities [Member]
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 153 78  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 153 78  
U.S. [Member] | Corporate Debt Securities [Member] | Level 1
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 4 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 4 0  
U.S. [Member] | Corporate Debt Securities [Member] | Level 2
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 149 78  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 149 78  
U.S. [Member] | Corporate Debt Securities [Member] | Level 3
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 0  
U.S. [Member] | Debt securities Mutual funds [Member]
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 227 135  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 227 135  
U.S. [Member] | Debt securities Mutual funds [Member] | Level 1
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 227 135  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 227 135  
U.S. [Member] | Debt securities Mutual funds [Member] | Level 2
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 0  
U.S. [Member] | Debt securities Mutual funds [Member] | Level 3
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 0  
U.S. [Member] | Other Debt Securities [Member]
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 50  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 50  
U.S. [Member] | Other Debt Securities [Member] | Level 1
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 0  
U.S. [Member] | Other Debt Securities [Member] | Level 2
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 50  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 50  
U.S. [Member] | Other Debt Securities [Member] | Level 3
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 0  
U.S. [Member] | Real Estate [Member]
     
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Target Plan Asset Allocations 2.00%    
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Actual Plan Asset Allocations 0.00% 0.00%  
U.S. [Member] | Cash and Cash Equivalents [Member]
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 43 43  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 43 43  
U.S. [Member] | Cash and Cash Equivalents [Member] | Level 1
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 43 43  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 43 43  
U.S. [Member] | Cash and Cash Equivalents [Member] | Level 2
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 0  
U.S. [Member] | Cash and Cash Equivalents [Member] | Level 3
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 0  
U.S. [Member] | Other Plan Investments [Member]
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets at beginning of year 165    
Fair value of plan assets as of December 31 143    
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Target Plan Asset Allocations 8.00%    
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Actual Plan Asset Allocations 21.06% 27.30%  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 143    
U.S. [Member] | Other Plan Investments [Member] | Level 1
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 38 72  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 38 72  
U.S. [Member] | Other Plan Investments [Member] | Level 2
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 105 93  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 105 93  
U.S. [Member] | Other Plan Investments [Member] | Level 3
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 0  
U.S. [Member] | Debt securities
     
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Target Plan Asset Allocations 49.00%    
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Actual Plan Asset Allocations 46.66% 38.58%  
Foreign [Member]
     
Definted Benefit Plan General Disclosures [Abstract]      
Defined Benefit Plan Number Of Plans Disclosure 26    
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 5,789 5,986  
Service cost 19 19 16
Interest cost 481 564 510
Employee contributions 5 5  
Plan amendments 1 0  
Plan curtailments 0 5  
Plan settlements (2) 0  
Benefits paid (408) (465)  
Business combinations 0 0  
Assumption Of A Plan Due To Resolution Of Bankruptcy Proceedings 0 0  
Actuarial loss 1,339 371  
Effect of foreign currency exchange rate change (415) (696)  
Benefit obligation as of December 31 6,809 5,789 5,986
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets at beginning of year 4,400 4,730  
Actual return on plan assets 888 486  
Employer contributions 155 175  
Employee contributions 5 5  
Plan settlements (2) 0  
Benefits paid (408) (465)  
Business combinations 0 0  
Assumption Of A Plan Due To Resolution Of Bankruptcy Proceedings 0 0  
Effect of foreign currency exchange rate change (326) (531)  
Fair value of plan assets as of December 31 4,712 4,400 4,730
Defined Benefit Plan, Funded Status of Plan [Abstract]      
Funded status as of December 31 (2,097) (1,389)  
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]      
Noncurrent assets 0 20  
Accrued benefit liability - current 6 4  
Accrued benefit liability - long-term 2,091 1,405  
Net amount recognized at end of year (2,097) (1,389)  
Accumulated Benefit Obligation Disclosure [Abstract]      
Accumulated Benefit Obligation 6,695 5,724  
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]      
Projected benefit obligation 6,438 5,478  
Accumulated benefit obligation 6,352 5,423  
Fair value of plan assets 4,360 4,072  
Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets [Abstract]      
Projected benefit obligation 6,809 5,492  
Fair value of plan assets 4,712 4,084  
Funded status as of December 31 (2,097) (1,389)  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]      
Discount rates 8.25% 9.52%  
Rates of compensation increase 6.45% 5.98%  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]      
Discount rate 9.52% 9.82%  
Expected long-term rate of return on plan assets 10.81% 11.08%  
Rate of compensation increase 5.98% 5.98%  
Defined Benefit Plan Net Periodic Benefit Cost Abstract      
Service cost 19 19 16
Interest cost 481 564 510
Expected return on plan assets (418) (508) (427)
Amortization of initial net asset 0 0 (1)
Amortization of prior service cost 0 0 0
Amortization of net loss (37) (23) (38)
Loss on curtailment 0 5 0
Settlement gain recognized 1 0 1
Total pension cost 120 103 137
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]      
Prior service cost (2)    
Unrecognized net actuarial loss 1,873    
Total (1,875)    
Defined Benefit Plan Amounts That Will Be Amortized From Accumulated Other Comprehensive Income Loss In Next Fiscal Year [Abstract]      
Prior service cost 0    
Total (83)    
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Actual Plan Asset Allocations 100.00% 100.00%  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 4,712 4,400 4,730
Defined Benefit Plan, Estimated Future Employer Contributions [Abstract]      
Expected employer contribution in 2013 165    
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]      
2013 425    
2014 439    
2015 457    
2016 474    
2017 492    
2018 - 2022 2,739    
Foreign [Member] | Level 1
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 634 584  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 634 584  
Foreign [Member] | Level 2
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 3,443 3,061  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 3,443 3,061  
Foreign [Member] | Level 3
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets at beginning of year 755 703  
Returns relating to assets still held at reporting date (60) 167  
Returns relating to assets sold during the period 0 28  
Purchases, sales and settlements, net 3 (48)  
Effect of foreign currency exchange rate change (63) (95)  
Fair value of plan assets as of December 31 635 755  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 635 755  
Foreign [Member] | Equity Securities Common Stock [Member]
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets at beginning of year 26    
Fair value of plan assets as of December 31 28    
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Target Plan Asset Allocations Range Minimum 15.00%    
Target Plan Asset Allocations Range Maximum 30.00%    
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Actual Plan Asset Allocations 19.76% 23.48%  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 28    
Foreign [Member] | Equity Securities Common Stock [Member] | Level 1
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 28 26  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 28 26  
Foreign [Member] | Equity Securities Common Stock [Member] | Level 2
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 0  
Foreign [Member] | Equity Securities Common Stock [Member] | Level 3
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 0  
Foreign [Member] | Equity securities Mutual funds [Member]
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 457 427  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 457 427  
Foreign [Member] | Equity securities Mutual funds [Member] | Level 1
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 457 427  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 457 427  
Foreign [Member] | Equity securities Mutual funds [Member] | Level 2
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 0  
Foreign [Member] | Equity securities Mutual funds [Member] | Level 3
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 0  
Foreign [Member] | Private Equity [Member]
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 446 580  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 446 580  
Foreign [Member] | Private Equity [Member] | Level 1
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 0  
Foreign [Member] | Private Equity [Member] | Level 2
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 0  
Foreign [Member] | Private Equity [Member] | Level 3
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 446 580  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 446 580  
Foreign [Member] | Debt securities Mutual funds [Member]
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 3,347 2,930  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 3,347 2,930  
Foreign [Member] | Debt securities Mutual funds [Member] | Level 1
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 139 125  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 139 125  
Foreign [Member] | Debt securities Mutual funds [Member] | Level 2
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 3,208 2,805  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 3,208 2,805  
Foreign [Member] | Debt securities Mutual funds [Member] | Level 3
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 0  
Foreign [Member] | Certificates of deposit [Member]
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 3 5  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 3 5  
Foreign [Member] | Certificates of deposit [Member] | Level 1
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 0  
Foreign [Member] | Certificates of deposit [Member] | Level 2
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 3 5  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 3 5  
Foreign [Member] | Certificates of deposit [Member] | Level 3
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 0  
Foreign [Member] | Unsecured Debentures [Member]
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 16 20  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 16 20  
Foreign [Member] | Unsecured Debentures [Member] | Level 1
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 0  
Foreign [Member] | Unsecured Debentures [Member] | Level 2
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 16 20  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 16 20  
Foreign [Member] | Unsecured Debentures [Member] | Level 3
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 0  
Foreign [Member] | Foreign Government Debt Securities [Member]
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 215 227  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 215 227  
Foreign [Member] | Foreign Government Debt Securities [Member] | Level 1
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 9 6  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 9 6  
Foreign [Member] | Foreign Government Debt Securities [Member] | Level 2
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 206 221  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 206 221  
Foreign [Member] | Foreign Government Debt Securities [Member] | Level 3
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 0  
Foreign [Member] | Other Debt Securities [Member]
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 10 10  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 10 10  
Foreign [Member] | Other Debt Securities [Member] | Level 1
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 0  
Foreign [Member] | Other Debt Securities [Member] | Level 2
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 10 10  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 10 10  
Foreign [Member] | Other Debt Securities [Member] | Level 3
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 0  
Foreign [Member] | Real Estate [Member]
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets at beginning of year 103    
Fair value of plan assets as of December 31 121    
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Target Plan Asset Allocations Range Minimum 0.00%    
Target Plan Asset Allocations Range Maximum 4.00%    
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Actual Plan Asset Allocations 2.57% 2.34%  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 121    
Foreign [Member] | Real Estate [Member] | Level 1
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 0  
Foreign [Member] | Real Estate [Member] | Level 2
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 0  
Foreign [Member] | Real Estate [Member] | Level 3
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 121 103  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 121 103  
Foreign [Member] | Cash and Cash Equivalents [Member]
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 1 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 1 0  
Foreign [Member] | Cash and Cash Equivalents [Member] | Level 1
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 1 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 1 0  
Foreign [Member] | Cash and Cash Equivalents [Member] | Level 2
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 0  
Foreign [Member] | Cash and Cash Equivalents [Member] | Level 3
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 0  
Foreign [Member] | Participant Loan [Member]
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 68 72  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 68 72  
Foreign [Member] | Participant Loan [Member] | Level 1
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 0  
Foreign [Member] | Participant Loan [Member] | Level 2
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 0 0  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets 0 0  
Foreign [Member] | Participant Loan [Member] | Level 3
     
Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward      
Fair value of plan assets as of December 31 68 72  
Defined Benefit Plan Fair Value Hierarchy [Abstract]      
Fair value of plan assets $ 68 $ 72  
Foreign [Member] | Other Plan Investments [Member]
     
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Target Plan Asset Allocations Range Minimum 0.00%    
Target Plan Asset Allocations Range Maximum 6.00%    
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Actual Plan Asset Allocations 1.46% 1.63%  
Foreign [Member] | Debt securities
     
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Target Plan Asset Allocations Range Minimum 59.00%    
Target Plan Asset Allocations Range Maximum 85.00%    
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Actual Plan Asset Allocations 76.21% 72.55%