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Retirement Benefits - Fair Value of Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan Percent Of Employer And Related Party Securities Included In Plan Assets Maximum 1.00%    
Alternatives      
Defined Benefit Plan Disclosure [Line Items]      
Lagged Valuation Adjustments Range, High 6 months    
Hedge funds      
Defined Benefit Plan Disclosure [Line Items]      
Lagged Valuation Adjustments Range, High 6 months    
U.S. Plans      
Defined Benefit Plan Disclosure [Line Items]      
Expected long-term rate of return on assets 6.75%    
Defined Benefit Plan Fair Value Of Plan Assets Dividends And Interest Receivable $ 345 $ 363  
Defined Benefit Plan, Fair Value of Plan Assets 41,939 41,252 $ 44,844
Net Asset Value Excluded From Fair Value By Input 6,645 6,437  
U.S. Plans | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 9,212 8,469  
U.S. Plans | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 26,068 26,324  
U.S. Plans | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 14 22  
U.S. Plans | Equity      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 3,843 3,039  
Net Asset Value Excluded From Fair Value By Input 7 7  
U.S. Plans | Equity | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 3,810 3,017  
U.S. Plans | Equity | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 25 14  
U.S. Plans | Equity | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 1 1  
U.S. Plans | U.S. companies      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 2,359 1,939  
Net Asset Value Excluded From Fair Value By Input 0 0  
U.S. Plans | U.S. companies | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 2,353 1,935  
U.S. Plans | U.S. companies | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 6 4  
U.S. Plans | U.S. companies | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
U.S. Plans | International companies      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 1,484 1,100  
Net Asset Value Excluded From Fair Value By Input 7 7  
U.S. Plans | International companies | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 1,457 1,082  
U.S. Plans | International companies | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 19 10  
U.S. Plans | International companies | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets $ 1 1  
U.S. Plans | Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Target Plan Asset Allocations 80.00%    
Defined Benefit Plan, Fair Value of Plan Assets $ 31,002 31,665  
Net Asset Value Excluded From Fair Value By Input 153 174  
U.S. Plans | Fixed Income | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 5,184 5,231  
U.S. Plans | Fixed Income | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 25,652 26,239  
U.S. Plans | Fixed Income | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 13 21  
U.S. Plans | U.S. government      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 5,157 5,209  
Net Asset Value Excluded From Fair Value By Input 0 0  
U.S. Plans | U.S. government | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 5,157 5,209  
U.S. Plans | U.S. government | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
U.S. Plans | U.S. government | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
U.S. Plans | U.S. government-sponsored enterprises      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 3,030 3,106  
Net Asset Value Excluded From Fair Value By Input 0 0  
U.S. Plans | U.S. government-sponsored enterprises | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
U.S. Plans | U.S. government-sponsored enterprises | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 3,030 3,106  
U.S. Plans | U.S. government-sponsored enterprises | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
U.S. Plans | Non-U.S. government      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 1,343 1,588  
Net Asset Value Excluded From Fair Value By Input 0 0  
U.S. Plans | Non-U.S. government | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
U.S. Plans | Non-U.S. government | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 1,343 1,588  
U.S. Plans | Non-U.S. government | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
U.S. Plans | Investment grade      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 8,922 18,687  
Net Asset Value Excluded From Fair Value By Input 0 0  
U.S. Plans | Investment grade | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
U.S. Plans | Investment grade | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 8,922 18,687  
U.S. Plans | Investment grade | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
U.S. Plans | High yield      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 11,525 1,585  
Net Asset Value Excluded From Fair Value By Input 0 0  
U.S. Plans | High yield | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
U.S. Plans | High yield | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 11,512 1,576  
U.S. Plans | High yield | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 13 9  
U.S. Plans | Other credit      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 203 412  
Net Asset Value Excluded From Fair Value By Input 0 0  
U.S. Plans | Other credit | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
U.S. Plans | Other credit | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 203 412  
U.S. Plans | Other credit | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
U.S. Plans | Mortgage/other asset-backed      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 855 1,113  
Net Asset Value Excluded From Fair Value By Input 0 0  
U.S. Plans | Mortgage/other asset-backed | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
U.S. Plans | Mortgage/other asset-backed | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 855 1,101  
U.S. Plans | Mortgage/other asset-backed | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 12  
U.S. Plans | Commingled funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 153 174  
Net Asset Value Excluded From Fair Value By Input 153 174  
U.S. Plans | Commingled funds | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
U.S. Plans | Commingled funds | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
U.S. Plans | Commingled funds | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
U.S. Plans | Fixed Income Funds Net Derivative Financial Instruments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets (186) (209)  
Net Asset Value Excluded From Fair Value By Input 0 0  
U.S. Plans | Fixed Income Funds Net Derivative Financial Instruments [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 27 22  
U.S. Plans | Fixed Income Funds Net Derivative Financial Instruments [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets (213) (231)  
U.S. Plans | Fixed Income Funds Net Derivative Financial Instruments [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets $ 0 0  
U.S. Plans | Growth Assets [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Target Plan Asset Allocations 20.00%    
U.S. Plans | Alternatives      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets $ 6,643 6,451  
Net Asset Value Excluded From Fair Value By Input 6,485 6,256  
U.S. Plans | Alternatives | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
U.S. Plans | Alternatives | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 158 195  
U.S. Plans | Alternatives | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
U.S. Plans | Hedge funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 2,960 2,723  
Net Asset Value Excluded From Fair Value By Input 2,802 2,548  
U.S. Plans | Hedge funds | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
U.S. Plans | Hedge funds | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 158 175  
U.S. Plans | Hedge funds | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
U.S. Plans | Private equity      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 2,548 2,745  
Net Asset Value Excluded From Fair Value By Input 2,548 2,745  
U.S. Plans | Private equity | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
U.S. Plans | Private equity | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
U.S. Plans | Private equity | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
U.S. Plans | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 1,135 983  
Net Asset Value Excluded From Fair Value By Input 1,135 963  
U.S. Plans | Real estate | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
U.S. Plans | Real estate | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 20  
U.S. Plans | Real estate | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
U.S. Plans | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 1,603 1,324  
Net Asset Value Excluded From Fair Value By Input 0 0  
U.S. Plans | Cash and cash equivalents | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 218 221  
U.S. Plans | Cash and cash equivalents | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 1,385 1,103  
U.S. Plans | Cash and cash equivalents | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
U.S. Plans | Other      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets (1,152) (1,227)  
Net Asset Value Excluded From Fair Value By Input 0 0  
U.S. Plans | Other | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
U.S. Plans | Other | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets (1,152) (1,227)  
U.S. Plans | Other | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets $ 0 0  
Non-U.S. Plans      
Defined Benefit Plan Disclosure [Line Items]      
Expected long-term rate of return on assets 5.19%    
Defined Benefit Plan Fair Value Of Plan Assets Dividends And Interest Receivable $ 93 94  
Defined Benefit Plan, Fair Value of Plan Assets 25,549 25,141 $ 25,675
Net Asset Value Excluded From Fair Value By Input 2,547 3,570  
Non-U.S. Plans | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 3,330 3,076  
Non-U.S. Plans | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 14,420 13,238  
Non-U.S. Plans | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 5,252 5,257  
Non-U.S. Plans | Equity      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 3,345 3,346  
Net Asset Value Excluded From Fair Value By Input 0 115  
Non-U.S. Plans | Equity | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 2,892 2,937  
Non-U.S. Plans | Equity | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 453 293  
Non-U.S. Plans | Equity | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 1  
Non-U.S. Plans | U.S. companies      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 1,707 1,734  
Net Asset Value Excluded From Fair Value By Input 0 86  
Non-U.S. Plans | U.S. companies | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 1,614 1,647  
Non-U.S. Plans | U.S. companies | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 93 1  
Non-U.S. Plans | U.S. companies | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Non-U.S. Plans | International companies      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 1,638 1,612  
Net Asset Value Excluded From Fair Value By Input 0 29  
Non-U.S. Plans | International companies | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 1,278 1,290  
Non-U.S. Plans | International companies | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 360 292  
Non-U.S. Plans | International companies | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 1  
Non-U.S. Plans | Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 14,667 13,971  
Net Asset Value Excluded From Fair Value By Input 0 379  
Non-U.S. Plans | Fixed Income | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 438 139  
Non-U.S. Plans | Fixed Income | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 14,229 13,453  
Non-U.S. Plans | Fixed Income | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Non-U.S. Plans | U.S. government      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 433 138  
Net Asset Value Excluded From Fair Value By Input 0 0  
Non-U.S. Plans | U.S. government | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 433 138  
Non-U.S. Plans | U.S. government | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Non-U.S. Plans | U.S. government | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Non-U.S. Plans | U.S. government-sponsored enterprises      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 57 10  
Net Asset Value Excluded From Fair Value By Input 0 0  
Non-U.S. Plans | U.S. government-sponsored enterprises | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Non-U.S. Plans | U.S. government-sponsored enterprises | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 57 10  
Non-U.S. Plans | U.S. government-sponsored enterprises | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Non-U.S. Plans | Non-U.S. government      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 11,171 10,650  
Net Asset Value Excluded From Fair Value By Input 0 0  
Non-U.S. Plans | Non-U.S. government | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Non-U.S. Plans | Non-U.S. government | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 11,171 10,650  
Non-U.S. Plans | Non-U.S. government | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Non-U.S. Plans | Investment grade      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 1,014 2,027  
Net Asset Value Excluded From Fair Value By Input 0 0  
Non-U.S. Plans | Investment grade | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Non-U.S. Plans | Investment grade | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 1,014 2,027  
Non-U.S. Plans | Investment grade | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Non-U.S. Plans | High yield      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 1,338 539  
Net Asset Value Excluded From Fair Value By Input 0 0  
Non-U.S. Plans | High yield | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Non-U.S. Plans | High yield | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 1,338 539  
Non-U.S. Plans | High yield | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Non-U.S. Plans | Other credit      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 65  
Net Asset Value Excluded From Fair Value By Input 0 0  
Non-U.S. Plans | Other credit | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Non-U.S. Plans | Other credit | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 65  
Non-U.S. Plans | Other credit | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Non-U.S. Plans | Mortgage/other asset-backed      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 242 292  
Net Asset Value Excluded From Fair Value By Input 0 0  
Non-U.S. Plans | Mortgage/other asset-backed | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Non-U.S. Plans | Mortgage/other asset-backed | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 242 292  
Non-U.S. Plans | Mortgage/other asset-backed | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Non-U.S. Plans | Commingled funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 379 379  
Net Asset Value Excluded From Fair Value By Input 0 379  
Non-U.S. Plans | Commingled funds | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Non-U.S. Plans | Commingled funds | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 379 0  
Non-U.S. Plans | Commingled funds | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Non-U.S. Plans | Fixed Income Funds Net Derivative Financial Instruments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 33 (129)  
Net Asset Value Excluded From Fair Value By Input 0 0  
Non-U.S. Plans | Fixed Income Funds Net Derivative Financial Instruments [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 5 1  
Non-U.S. Plans | Fixed Income Funds Net Derivative Financial Instruments [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 28 (130)  
Non-U.S. Plans | Fixed Income Funds Net Derivative Financial Instruments [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Non-U.S. Plans | Alternatives      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 2,760 3,185  
Net Asset Value Excluded From Fair Value By Input 2,547 3,076  
Non-U.S. Plans | Alternatives | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Non-U.S. Plans | Alternatives | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 213 109  
Non-U.S. Plans | Alternatives | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Non-U.S. Plans | Hedge funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 1,598 1,870  
Net Asset Value Excluded From Fair Value By Input 1,383 1,762  
Non-U.S. Plans | Hedge funds | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Non-U.S. Plans | Hedge funds | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 215 108  
Non-U.S. Plans | Hedge funds | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Non-U.S. Plans | Private equity      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 679 633  
Net Asset Value Excluded From Fair Value By Input 679 633  
Non-U.S. Plans | Private equity | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Non-U.S. Plans | Private equity | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Non-U.S. Plans | Private equity | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Non-U.S. Plans | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 483 682  
Net Asset Value Excluded From Fair Value By Input 485 681  
Non-U.S. Plans | Real estate | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Non-U.S. Plans | Real estate | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets (2) 1  
Non-U.S. Plans | Real estate | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Non-U.S. Plans | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 97 556  
Net Asset Value Excluded From Fair Value By Input 0 0  
Non-U.S. Plans | Cash and cash equivalents | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Non-U.S. Plans | Cash and cash equivalents | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 97 556  
Non-U.S. Plans | Cash and cash equivalents | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Non-U.S. Plans | Other      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 4,680 4,083  
Net Asset Value Excluded From Fair Value By Input 0 0  
Non-U.S. Plans | Other | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Non-U.S. Plans | Other | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets (572) (1,173)  
Non-U.S. Plans | Other | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets $ 5,252 5,256  
Non-U.S. Plans | United Kingdom      
Defined Benefit Plan Disclosure [Line Items]      
Expected long-term rate of return on assets 5.75%    
Non-U.S. Plans | Canada      
Defined Benefit Plan Disclosure [Line Items]      
Expected long-term rate of return on assets 5.50%    
Non-U.S. Plans | Ford Werke GmbH [Member] | Other Pension Benefit Plan Asset Insurance Contracts [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets $ 4,500 $ 4,400