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Retirement-Related Benefits (Details 7) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Defined Benefit Pension Plans
U.S. Plan(s)
Dec. 31, 2011
Defined Benefit Pension Plans
U.S. Plan(s)
Dec. 31, 2012
Defined Benefit Pension Plans
Non-U.S. Plans
Dec. 31, 2011
Defined Benefit Pension Plans
Non-U.S. Plans
Dec. 31, 2012
Defined Benefit Pension Plans
Level 3
Non-U.S. Plans
Dec. 31, 2011
Defined Benefit Pension Plans
Level 3
Non-U.S. Plans
Dec. 31, 2012
Defined Benefit Pension Plans
Level 3
Non-U.S. Plans
Government and related
Dec. 31, 2011
Defined Benefit Pension Plans
Level 3
Non-U.S. Plans
Government and related
Dec. 31, 2012
Defined Benefit Pension Plans
Level 3
Non-U.S. Plans
Corporate bonds
Dec. 31, 2011
Defined Benefit Pension Plans
Level 3
Non-U.S. Plans
Corporate bonds
Dec. 31, 2012
Defined Benefit Pension Plans
Level 3
Non-U.S. Plans
Private equity
Dec. 31, 2011
Defined Benefit Pension Plans
Level 3
Non-U.S. Plans
Private equity
Dec. 31, 2012
Defined Benefit Pension Plans
Level 3
Non-U.S. Plans
Private real estate
Dec. 31, 2011
Defined Benefit Pension Plans
Level 3
Non-U.S. Plans
Private real estate
Dec. 31, 2012
Qualified PPP (Qualified defined benefit pension plans)
U.S. Plan(s)
Dec. 31, 2011
Qualified PPP (Qualified defined benefit pension plans)
U.S. Plan(s)
Dec. 31, 2012
Qualified PPP (Qualified defined benefit pension plans)
Level 3
U.S. Plan(s)
Dec. 31, 2011
Qualified PPP (Qualified defined benefit pension plans)
Level 3
U.S. Plan(s)
Dec. 31, 2012
Qualified PPP (Qualified defined benefit pension plans)
Level 3
U.S. Plan(s)
Government and related
Dec. 31, 2011
Qualified PPP (Qualified defined benefit pension plans)
Level 3
U.S. Plan(s)
Government and related
Dec. 31, 2012
Qualified PPP (Qualified defined benefit pension plans)
Level 3
U.S. Plan(s)
Corporate bonds
Dec. 31, 2011
Qualified PPP (Qualified defined benefit pension plans)
Level 3
U.S. Plan(s)
Corporate bonds
Dec. 31, 2012
Qualified PPP (Qualified defined benefit pension plans)
Level 3
U.S. Plan(s)
Mortgage and asset-backed securities
Dec. 31, 2011
Qualified PPP (Qualified defined benefit pension plans)
Level 3
U.S. Plan(s)
Mortgage and asset-backed securities
Dec. 31, 2012
Qualified PPP (Qualified defined benefit pension plans)
Level 3
U.S. Plan(s)
Fixed income commingled/ mutual funds
Dec. 31, 2011
Qualified PPP (Qualified defined benefit pension plans)
Level 3
U.S. Plan(s)
Fixed income commingled/ mutual funds
Dec. 31, 2012
Qualified PPP (Qualified defined benefit pension plans)
Level 3
U.S. Plan(s)
Hedge funds
Dec. 31, 2011
Qualified PPP (Qualified defined benefit pension plans)
Level 3
U.S. Plan(s)
Hedge funds
Dec. 31, 2012
Qualified PPP (Qualified defined benefit pension plans)
Level 3
U.S. Plan(s)
Private equity
Dec. 31, 2011
Qualified PPP (Qualified defined benefit pension plans)
Level 3
U.S. Plan(s)
Private equity
Dec. 31, 2012
Qualified PPP (Qualified defined benefit pension plans)
Level 3
U.S. Plan(s)
Private real estate
Dec. 31, 2011
Qualified PPP (Qualified defined benefit pension plans)
Level 3
U.S. Plan(s)
Private real estate
Dec. 31, 2012
Nonpension Postretirement Plans
Dec. 31, 2011
Nonpension Postretirement Plans
Dec. 31, 2012
Nonpension Postretirement Plans
U.S. Plan(s)
Dec. 31, 2010
Nonpension Postretirement Plans
U.S. Plan(s)
Dec. 31, 2012
Nonpension Postretirement Plans
Non-U.S. Plans
Dec. 31, 2011
Nonpension Postretirement Plans
Non-U.S. Plans
Change in plan assets                                                                            
Fair value of plan assets, balance at the beginning of the period $ 51,218 $ 50,259 $ 35,362 $ 35,722 $ 977 $ 720 $ 96   $ 39 $ 11 $ 262 $ 176 $ 580 $ 533 $ 53,630 $ 51,218 $ 7,932 $ 7,786 $ 29   $ 12   $ 45 $ 56 $ 246 $ 221 $ 713 $ 624 $ 4,098 $ 4,251 $ 2,790 $ 2,634     $ 38 $ 35 $ 112 $ 120
Return on assets held at end of year         6 46 3 3 (1) 2 9 30 (5) 11     1,135 468 0 0 0 0 1 (1) 21 25 56 (35) 855 348 202 131            
Return on assets sold during the year         14 (5) 3 0 1 0 9 (2) 0 (3)     (359) 14 0 0 2 0 1 0     14 5 (334) (30) (41) 39            
Purchases, sales and settlements, net     40 (27) 21 237 (26) 100 (29) 28 62 65 14 44     (660) (492) (1) 12 (2) 5 (9) (16)     (26) (7) (533) (471) (90) (14)           0
Transfers, net         (10) 0 (2)   (5)   0 0 (3) 0     (15) 157 (22) 17 (1) 7 8 6       127                    
Foreign exchange impact     305 (537) 34 (22) 1 (7) 0 (2) 11 (7) 23 (6)                                             (8) (15)
Fair value of plan assets, balance at the end of the period 53,630 51,218 38,058 35,362 1,042 977 76 96 5 39 353 262 609 580 53,630 51,218 8,032 7,932 6 29 11 12 45 45 267 246 756 713 4,085 4,098 2,861 2,790     433 35 119 112
EXPECTED CONTRIBUTIONS                                                                            
Cash contribution by employer to non-U.S. defined benefit plans     557 728                                                                    
Cash contribution by employer to non-U.S. multi-employer plans     60 70                                                                    
Period over which company may smooth the change in value of pension assets under revised funding requirements in Worker, Retiree and Employer Recovery Act of 2008 24 months 24 months                                                                        
Employer contributions, excluding the Medicare-related subsidy                                                                 693 362 400      
Estimated future employer contributions in next fiscal year     $ 700