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Retirement Benefits - Fair Value of Plan Assets (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan Percent Of Employer And Related Party Securities Included In Plan Assets Maximum 1.00%    
U.S. Plans | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Expected long-term rate of return on assets 6.50%    
Defined Benefit Plan Fair Value Of Plan Assets Dividends And Interest Receivable $ 322,000,000 $ 340,000,000  
Defined Benefit Plan, Plan Assets, Amount 44,253,000,000 39,774,000,000 $ 44,160,000,000
U.S. Plans | Pension Plan | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 9,737,000,000 9,335,000,000  
U.S. Plans | Pension Plan | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 28,461,000,000 23,933,000,000  
U.S. Plans | Pension Plan | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 17,000,000 1,000,000  
U.S. Plans | Pension Plan | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 6,038,000,000 6,505,000,000  
U.S. Plans | Pension Plan | Fixed Income Funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 80.00%    
U.S. Plans | Pension Plan | Equity      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 2,543,000,000 2,061,000,000  
U.S. Plans | Pension Plan | Equity | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 2,513,000,000 2,033,000,000  
U.S. Plans | Pension Plan | Equity | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 29,000,000 27,000,000  
U.S. Plans | Pension Plan | Equity | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 1,000,000 1,000,000  
U.S. Plans | Pension Plan | Equity | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
U.S. Plans | Pension Plan | U.S. companies      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 1,562,000,000 1,263,000,000  
U.S. Plans | Pension Plan | U.S. companies | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 1,542,000,000 1,246,000,000  
U.S. Plans | Pension Plan | U.S. companies | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 20,000,000 17,000,000  
U.S. Plans | Pension Plan | U.S. companies | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
U.S. Plans | Pension Plan | U.S. companies | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
U.S. Plans | Pension Plan | International companies      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 981,000,000 798,000,000  
U.S. Plans | Pension Plan | International companies | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 971,000,000 787,000,000  
U.S. Plans | Pension Plan | International companies | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 9,000,000 10,000,000  
U.S. Plans | Pension Plan | International companies | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 1,000,000 1,000,000  
U.S. Plans | Pension Plan | International companies | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
U.S. Plans | Pension Plan | Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 37,404,000,000 31,830,000,000  
U.S. Plans | Pension Plan | Fixed Income | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 8,956,000,000 7,924,000,000  
U.S. Plans | Pension Plan | Fixed Income | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 28,432,000,000 23,906,000,000  
U.S. Plans | Pension Plan | Fixed Income | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 16,000,000 0  
U.S. Plans | Pension Plan | Fixed Income | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
U.S. Plans | Pension Plan | U.S. government      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 11,788,000,000 10,232,000,000  
U.S. Plans | Pension Plan | U.S. government | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 8,965,000,000 7,915,000,000  
U.S. Plans | Pension Plan | U.S. government | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 2,823,000,000 2,317,000,000  
U.S. Plans | Pension Plan | U.S. government | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
U.S. Plans | Pension Plan | U.S. government | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
U.S. Plans | Pension Plan | Non-U.S. government      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 1,337,000,000 1,073,000,000  
U.S. Plans | Pension Plan | Non-U.S. government | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
U.S. Plans | Pension Plan | Non-U.S. government | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 1,321,000,000 1,073,000,000  
U.S. Plans | Pension Plan | Non-U.S. government | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 16,000,000 0  
U.S. Plans | Pension Plan | Non-U.S. government | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
U.S. Plans | Pension Plan | Corporate bonds      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 23,717,000,000 19,905,000,000  
U.S. Plans | Pension Plan | Corporate bonds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
U.S. Plans | Pension Plan | Corporate bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 23,717,000,000 19,905,000,000  
U.S. Plans | Pension Plan | Corporate bonds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
U.S. Plans | Pension Plan | Corporate bonds | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
U.S. Plans | Pension Plan | Mortgage/other asset-backed      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 527,000,000 474,000,000  
U.S. Plans | Pension Plan | Mortgage/other asset-backed | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
U.S. Plans | Pension Plan | Mortgage/other asset-backed | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 527,000,000 474,000,000  
U.S. Plans | Pension Plan | Mortgage/other asset-backed | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
U.S. Plans | Pension Plan | Mortgage/other asset-backed | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
U.S. Plans | Pension Plan | Commingled funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 191,000,000 94,000,000  
U.S. Plans | Pension Plan | Commingled funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
U.S. Plans | Pension Plan | Commingled funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 191,000,000 94,000,000  
U.S. Plans | Pension Plan | Commingled funds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
U.S. Plans | Pension Plan | Commingled funds | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
U.S. Plans | Pension Plan | Fixed Income Funds Net Derivative Financial Instruments      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount (156,000,000) 52,000,000  
U.S. Plans | Pension Plan | Fixed Income Funds Net Derivative Financial Instruments | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount (9,000,000) 9,000,000  
U.S. Plans | Pension Plan | Fixed Income Funds Net Derivative Financial Instruments | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount (147,000,000) 43,000,000  
U.S. Plans | Pension Plan | Fixed Income Funds Net Derivative Financial Instruments | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
U.S. Plans | Pension Plan | Fixed Income Funds Net Derivative Financial Instruments | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 0 0  
U.S. Plans | Pension Plan | Growth Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 20.00%    
U.S. Plans | Pension Plan | Repurchase Agreements | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ (1,900,000,000) (1,700,000,000)  
U.S. Plans | Pension Plan | Alternatives      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 6,038,000,000 6,505,000,000  
U.S. Plans | Pension Plan | Alternatives | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
U.S. Plans | Pension Plan | Alternatives | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
U.S. Plans | Pension Plan | Alternatives | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
U.S. Plans | Pension Plan | Alternatives | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 6,038,000,000 6,505,000,000  
U.S. Plans | Pension Plan | Hedge funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 2,961,000,000 3,217,000,000  
U.S. Plans | Pension Plan | Hedge funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
U.S. Plans | Pension Plan | Hedge funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
U.S. Plans | Pension Plan | Hedge funds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
U.S. Plans | Pension Plan | Hedge funds | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 2,961,000,000 3,217,000,000  
U.S. Plans | Pension Plan | Private equity      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 1,884,000,000 2,046,000,000  
U.S. Plans | Pension Plan | Private equity | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
U.S. Plans | Pension Plan | Private equity | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
U.S. Plans | Pension Plan | Private equity | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
U.S. Plans | Pension Plan | Private equity | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 1,884,000,000 2,046,000,000  
U.S. Plans | Pension Plan | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 1,193,000,000 1,242,000,000  
U.S. Plans | Pension Plan | Real estate | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
U.S. Plans | Pension Plan | Real estate | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
U.S. Plans | Pension Plan | Real estate | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
U.S. Plans | Pension Plan | Real estate | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 1,193,000,000 1,242,000,000  
U.S. Plans | Pension Plan | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount (195,000,000) 354,000,000  
U.S. Plans | Pension Plan | Cash and cash equivalents | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount (195,000,000) 354,000,000  
U.S. Plans | Pension Plan | Cash and cash equivalents | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
U.S. Plans | Pension Plan | Cash and cash equivalents | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
U.S. Plans | Pension Plan | Cash and cash equivalents | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
U.S. Plans | Pension Plan | Other      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount (1,537,000,000) (976,000,000)  
U.S. Plans | Pension Plan | Other | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount (1,537,000,000) (976,000,000)  
U.S. Plans | Pension Plan | Other | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
U.S. Plans | Pension Plan | Other | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
U.S. Plans | Pension Plan | Other | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 0 0  
Non-U.S. Plans | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Expected long-term rate of return on assets 3.67%    
Defined Benefit Plan Fair Value Of Plan Assets Dividends And Interest Receivable $ 102,000,000 115,000,000  
Defined Benefit Plan, Plan Assets, Amount 29,958,000,000 27,273,000,000 $ 29,657,000,000
Non-U.S. Plans | Pension Plan | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount (223,000,000) 1,142,000,000  
Non-U.S. Plans | Pension Plan | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 22,382,000,000 18,639,000,000  
Non-U.S. Plans | Pension Plan | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 5,572,000,000 5,249,000,000  
Non-U.S. Plans | Pension Plan | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 2,227,000,000 2,243,000,000  
Non-U.S. Plans | Pension Plan | Equity      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 2,013,000,000 2,278,000,000  
Non-U.S. Plans | Pension Plan | Equity | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 1,909,000,000 2,040,000,000  
Non-U.S. Plans | Pension Plan | Equity | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 101,000,000 237,000,000  
Non-U.S. Plans | Pension Plan | Equity | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 3,000,000 1,000,000  
Non-U.S. Plans | Pension Plan | Equity | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Non-U.S. Plans | Pension Plan | U.S. companies      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 1,102,000,000 1,249,000,000  
Non-U.S. Plans | Pension Plan | U.S. companies | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 1,059,000,000 1,146,000,000  
Non-U.S. Plans | Pension Plan | U.S. companies | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 43,000,000 103,000,000  
Non-U.S. Plans | Pension Plan | U.S. companies | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Non-U.S. Plans | Pension Plan | U.S. companies | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Non-U.S. Plans | Pension Plan | International companies      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 911,000,000 1,029,000,000  
Non-U.S. Plans | Pension Plan | International companies | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 850,000,000 894,000,000  
Non-U.S. Plans | Pension Plan | International companies | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 58,000,000 134,000,000  
Non-U.S. Plans | Pension Plan | International companies | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 3,000,000 1,000,000  
Non-U.S. Plans | Pension Plan | International companies | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Non-U.S. Plans | Pension Plan | Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 22,725,000,000 18,830,000,000  
Non-U.S. Plans | Pension Plan | Fixed Income | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 395,000,000 428,000,000  
Non-U.S. Plans | Pension Plan | Fixed Income | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 22,281,000,000 18,402,000,000  
Non-U.S. Plans | Pension Plan | Fixed Income | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 49,000,000 0  
Non-U.S. Plans | Pension Plan | Fixed Income | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Non-U.S. Plans | Pension Plan | U.S. government      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 474,000,000 563,000,000  
Non-U.S. Plans | Pension Plan | U.S. government | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 380,000,000 415,000,000  
Non-U.S. Plans | Pension Plan | U.S. government | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 94,000,000 148,000,000  
Non-U.S. Plans | Pension Plan | U.S. government | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Non-U.S. Plans | Pension Plan | U.S. government | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Non-U.S. Plans | Pension Plan | Non-U.S. government      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 18,256,000,000 14,871,000,000  
Non-U.S. Plans | Pension Plan | Non-U.S. government | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Non-U.S. Plans | Pension Plan | Non-U.S. government | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 18,256,000,000 14,871,000,000  
Non-U.S. Plans | Pension Plan | Non-U.S. government | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Non-U.S. Plans | Pension Plan | Non-U.S. government | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Non-U.S. Plans | Pension Plan | Corporate bonds      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 3,124,000,000 2,875,000,000  
Non-U.S. Plans | Pension Plan | Corporate bonds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Non-U.S. Plans | Pension Plan | Corporate bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 3,089,000,000 2,875,000,000  
Non-U.S. Plans | Pension Plan | Corporate bonds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 35,000,000 0  
Non-U.S. Plans | Pension Plan | Corporate bonds | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Non-U.S. Plans | Pension Plan | Mortgage/other asset-backed      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 634,000,000 286,000,000  
Non-U.S. Plans | Pension Plan | Mortgage/other asset-backed | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Non-U.S. Plans | Pension Plan | Mortgage/other asset-backed | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 565,000,000 286,000,000  
Non-U.S. Plans | Pension Plan | Mortgage/other asset-backed | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 69,000,000 0  
Non-U.S. Plans | Pension Plan | Mortgage/other asset-backed | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Non-U.S. Plans | Pension Plan | Commingled funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 175,000,000 268,000,000  
Non-U.S. Plans | Pension Plan | Commingled funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Non-U.S. Plans | Pension Plan | Commingled funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 174,000,000 268,000,000  
Non-U.S. Plans | Pension Plan | Commingled funds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 1,000,000 0  
Non-U.S. Plans | Pension Plan | Commingled funds | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Non-U.S. Plans | Pension Plan | Fixed Income Funds Net Derivative Financial Instruments      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 62,000,000 (33,000,000)  
Non-U.S. Plans | Pension Plan | Fixed Income Funds Net Derivative Financial Instruments | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 15,000,000 13,000,000  
Non-U.S. Plans | Pension Plan | Fixed Income Funds Net Derivative Financial Instruments | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 103,000,000 (46,000,000)  
Non-U.S. Plans | Pension Plan | Fixed Income Funds Net Derivative Financial Instruments | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount (56,000,000) 0  
Non-U.S. Plans | Pension Plan | Fixed Income Funds Net Derivative Financial Instruments | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Non-U.S. Plans | Pension Plan | Repurchase Agreements | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount (2,500,000,000) (1,400,000,000)  
Non-U.S. Plans | Pension Plan | Alternatives      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 2,227,000,000 2,243,000,000  
Non-U.S. Plans | Pension Plan | Alternatives | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Non-U.S. Plans | Pension Plan | Alternatives | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Non-U.S. Plans | Pension Plan | Alternatives | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Non-U.S. Plans | Pension Plan | Alternatives | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 2,227,000,000 2,243,000,000  
Non-U.S. Plans | Pension Plan | Hedge funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 1,207,000,000 1,143,000,000  
Non-U.S. Plans | Pension Plan | Hedge funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Non-U.S. Plans | Pension Plan | Hedge funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Non-U.S. Plans | Pension Plan | Hedge funds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Non-U.S. Plans | Pension Plan | Hedge funds | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 1,207,000,000 1,143,000,000  
Non-U.S. Plans | Pension Plan | Private equity      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 695,000,000 687,000,000  
Non-U.S. Plans | Pension Plan | Private equity | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Non-U.S. Plans | Pension Plan | Private equity | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Non-U.S. Plans | Pension Plan | Private equity | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Non-U.S. Plans | Pension Plan | Private equity | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 695,000,000 687,000,000  
Non-U.S. Plans | Pension Plan | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 325,000,000 413,000,000  
Non-U.S. Plans | Pension Plan | Real estate | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Non-U.S. Plans | Pension Plan | Real estate | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Non-U.S. Plans | Pension Plan | Real estate | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Non-U.S. Plans | Pension Plan | Real estate | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 325,000,000 413,000,000  
Non-U.S. Plans | Pension Plan | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount (1,765,000,000) (641,000,000)  
Non-U.S. Plans | Pension Plan | Cash and cash equivalents | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount (1,765,000,000) (641,000,000)  
Non-U.S. Plans | Pension Plan | Cash and cash equivalents | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Non-U.S. Plans | Pension Plan | Cash and cash equivalents | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Non-U.S. Plans | Pension Plan | Cash and cash equivalents | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Non-U.S. Plans | Pension Plan | Other      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 4,758,000,000 4,563,000,000  
Non-U.S. Plans | Pension Plan | Other | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount (762,000,000) (685,000,000)  
Non-U.S. Plans | Pension Plan | Other | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Non-U.S. Plans | Pension Plan | Other | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 5,520,000,000 5,248,000,000  
Non-U.S. Plans | Pension Plan | Other | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Non-U.S. Plans | Pension Plan | Ford Werke GmbH | Other Pension Benefit Plan Asset Insurance Contracts [Member] | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 4,500,000,000 $ 4,300,000,000  
Canada | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Expected long-term rate of return on assets 4.75%    
United Kingdom | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Expected long-term rate of return on assets 3.50%