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Pension and Other Postretirement Employee Benefit Plans (Details) (USD $)
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
U.S. Defined Benefit Pension and OPEB Plans
     
Amortization:     
Fair value of plan assets$ 11,500,000,000 $ 11,500,000,000 $ 12,200,000,000
OPEB Plans [Member]
     
Components of net periodic benefit cost [Abstract]     
Benefits earned during the period1,000,00001,000,0001,000,000 
Interest cost on benefit obligations13,000,00014,000,00039,000,00042,000,000 
Expected return on plan assets(22,000,000)(25,000,000)(66,000,000)(73,000,000) 
Amortization:     
Net loss0000 
Prior service cost/(credit)(2,000,000)(3,000,000)(6,000,000)(10,000,000) 
Settlement loss0000 
Net periodic defined benefit cost(10,000,000)(14,000,000)(32,000,000)(40,000,000) 
Total defined benefit plans(10,000,000)(14,000,000)(32,000,000)(40,000,000) 
Total pension and OPEB cost included in compensation expense(10,000,000)(14,000,000)(32,000,000)(40,000,000) 
Expected cost of funding benefits2,000,000 2,000,000  
Defined benefit pension plans, U.S. [Member]
     
Components of net periodic benefit cost [Abstract]     
Benefits earned during the period62,000,00057,000,000186,000,000173,000,000 
Interest cost on benefit obligations113,000,000117,000,000339,000,000351,000,000 
Expected return on plan assets(197,000,000)(186,000,000)(592,000,000)(557,000,000) 
Amortization:     
Net loss41,000,00056,000,000123,000,000168,000,000 
Prior service cost/(credit)(11,000,000)(10,000,000)(32,000,000)(32,000,000) 
Settlement loss0000 
Net periodic defined benefit cost8,000,00034,000,00024,000,000103,000,000 
Other defined benefit pension plans3,000,0004,000,00014,000,00011,000,000 
Total defined benefit plans11,000,00038,000,00038,000,000114,000,000 
Total defined contribution plans122,000,000102,000,000289,000,000249,000,000 
Total pension and OPEB cost included in compensation expense133,000,000140,000,000327,000,000363,000,000 
Expected cost of funding benefits42,000,000 42,000,000  
Defined benefit pension plans, Non-U.S. [Member]
     
Components of net periodic benefit cost [Abstract]     
Benefits earned during the period9,000,0008,000,00027,000,00021,000,000 
Interest cost on benefit obligations33,000,00033,000,000101,000,00096,000,000 
Expected return on plan assets(35,000,000)(33,000,000)(107,000,000)(95,000,000) 
Amortization:     
Net loss12,000,00015,000,00036,000,00042,000,000 
Prior service cost/(credit)0(1,000,000)(1,000,000)(1,000,000) 
Settlement loss02,000,00002,000,000 
Net periodic defined benefit cost19,000,00024,000,00056,000,00065,000,000 
Other defined benefit pension plans3,000,0003,000,00012,000,0008,000,000 
Total defined benefit plans22,000,00027,000,00068,000,00073,000,000 
Total defined contribution plans69,000,00070,000,000212,000,000202,000,000 
Total pension and OPEB cost included in compensation expense91,000,00097,000,000280,000,000275,000,000 
Fair value of plan assets2,800,000,000 2,800,000,000 2,600,000,000
Expected cost of funding benefits$ 166,000,000 $ 166,000,000