Retirement Benefits - Fair Value of Plan Assets (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
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 [Member]
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	$ 340,000,000	$ 344,000,000
Defined Benefit Plan, Plan Assets, Amount	39,774,000,000	44,160,000,000	$ 41,939,000,000
U.S. Plans | Pension Plan [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	9,335,000,000	10,845,000,000
U.S. Plans | Pension Plan [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	23,933,000,000	26,712,000,000
U.S. Plans | Pension Plan [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	1,000,000	5,000,000
U.S. Plans | Pension Plan [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 6,505,000,000	6,598,000,000
U.S. Plans | Pension Plan [Member] | Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	80.00%
U.S. Plans | Pension Plan [Member] | Equity
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 2,061,000,000	3,868,000,000
U.S. Plans | Pension Plan [Member] | Equity | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	2,033,000,000	3,804,000,000
U.S. Plans | Pension Plan [Member] | Equity | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	27,000,000	63,000,000
U.S. Plans | Pension Plan [Member] | Equity | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	1,000,000	1,000,000
U.S. Plans | Pension Plan [Member] | Equity | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Plans | Pension Plan [Member] | U.S. companies
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	1,263,000,000	2,160,000,000
U.S. Plans | Pension Plan [Member] | U.S. companies | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	1,246,000,000	2,135,000,000
U.S. Plans | Pension Plan [Member] | U.S. companies | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	17,000,000	25,000,000
U.S. Plans | Pension Plan [Member] | U.S. companies | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Plans | Pension Plan [Member] | U.S. companies | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Plans | Pension Plan [Member] | International companies
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	798,000,000	1,708,000,000
U.S. Plans | Pension Plan [Member] | International companies | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	787,000,000	1,669,000,000
U.S. Plans | Pension Plan [Member] | International companies | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	10,000,000	38,000,000
U.S. Plans | Pension Plan [Member] | International companies | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	1,000,000	1,000,000
U.S. Plans | Pension Plan [Member] | International companies | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Plans | Pension Plan [Member] | Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	31,830,000,000	33,267,000,000
U.S. Plans | Pension Plan [Member] | Fixed Income | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	7,924,000,000	6,614,000,000
U.S. Plans | Pension Plan [Member] | Fixed Income | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	23,906,000,000	26,649,000,000
U.S. Plans | Pension Plan [Member] | Fixed Income | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	4,000,000
U.S. Plans | Pension Plan [Member] | Fixed Income | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Plans | Pension Plan [Member] | U.S. government
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	10,232,000,000	9,445,000,000
U.S. Plans | Pension Plan [Member] | U.S. government | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	7,915,000,000	6,603,000,000
U.S. Plans | Pension Plan [Member] | U.S. government | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	2,317,000,000	2,842,000,000
U.S. Plans | Pension Plan [Member] | U.S. government | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Plans | Pension Plan [Member] | U.S. government | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Plans | Pension Plan [Member] | Non-U.S. government
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	1,073,000,000	1,575,000,000
U.S. Plans | Pension Plan [Member] | Non-U.S. government | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Plans | Pension Plan [Member] | Non-U.S. government | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	1,073,000,000	1,575,000,000
U.S. Plans | Pension Plan [Member] | Non-U.S. government | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Plans | Pension Plan [Member] | Non-U.S. government | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Plans | Pension Plan [Member] | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	19,905,000,000	21,621,000,000
U.S. Plans | Pension Plan [Member] | Corporate bonds | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Plans | Pension Plan [Member] | Corporate bonds | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	19,905,000,000	21,617,000,000
U.S. Plans | Pension Plan [Member] | Corporate bonds | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	4,000,000
U.S. Plans | Pension Plan [Member] | Corporate bonds | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Plans | Pension Plan [Member] | Mortgage/other asset-backed
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	474,000,000	590,000,000
U.S. Plans | Pension Plan [Member] | Mortgage/other asset-backed | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Plans | Pension Plan [Member] | Mortgage/other asset-backed | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	474,000,000	590,000,000
U.S. Plans | Pension Plan [Member] | Mortgage/other asset-backed | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Plans | Pension Plan [Member] | Mortgage/other asset-backed | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Plans | Pension Plan [Member] | Commingled funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	94,000,000	49,000,000
U.S. Plans | Pension Plan [Member] | Commingled funds | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Plans | Pension Plan [Member] | Commingled funds | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	94,000,000	49,000,000
U.S. Plans | Pension Plan [Member] | Commingled funds | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Plans | Pension Plan [Member] | Commingled funds | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Plans | Pension Plan [Member] | Fixed Income Funds Net Derivative Financial Instruments [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	52,000,000	(13,000,000)
U.S. Plans | Pension Plan [Member] | Fixed Income Funds Net Derivative Financial Instruments [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	9,000,000	11,000,000
U.S. Plans | Pension Plan [Member] | Fixed Income Funds Net Derivative Financial Instruments [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	43,000,000	(24,000,000)
U.S. Plans | Pension Plan [Member] | Fixed Income Funds Net Derivative Financial Instruments [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Plans | Pension Plan [Member] | Fixed Income Funds Net Derivative Financial Instruments [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 0	0
U.S. Plans | Pension Plan [Member] | Growth Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	20.00%
U.S. Plans | Pension Plan [Member] | Repurchase Agreements [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ (1,700,000,000)	(360,000,000)
U.S. Plans | Pension Plan [Member] | Alternatives
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	6,505,000,000	6,598,000,000
U.S. Plans | Pension Plan [Member] | Alternatives | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Plans | Pension Plan [Member] | Alternatives | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Plans | Pension Plan [Member] | Alternatives | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Plans | Pension Plan [Member] | Alternatives | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	6,505,000,000	6,598,000,000
U.S. Plans | Pension Plan [Member] | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	3,217,000,000	3,060,000,000
U.S. Plans | Pension Plan [Member] | Hedge funds | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Plans | Pension Plan [Member] | Hedge funds | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Plans | Pension Plan [Member] | Hedge funds | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Plans | Pension Plan [Member] | Hedge funds | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	3,217,000,000	3,060,000,000
U.S. Plans | Pension Plan [Member] | Private equity
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	2,046,000,000	2,322,000,000
U.S. Plans | Pension Plan [Member] | Private equity | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Plans | Pension Plan [Member] | Private equity | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Plans | Pension Plan [Member] | Private equity | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Plans | Pension Plan [Member] | Private equity | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	2,046,000,000	2,322,000,000
U.S. Plans | Pension Plan [Member] | Real estate
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	1,242,000,000	1,216,000,000
U.S. Plans | Pension Plan [Member] | Real estate | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Plans | Pension Plan [Member] | Real estate | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Plans | Pension Plan [Member] | Real estate | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Plans | Pension Plan [Member] | Real estate | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	1,242,000,000	1,216,000,000
U.S. Plans | Pension Plan [Member] | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	354,000,000	1,380,000,000
U.S. Plans | Pension Plan [Member] | Cash and cash equivalents | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	354,000,000	1,380,000,000
U.S. Plans | Pension Plan [Member] | Cash and cash equivalents | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Plans | Pension Plan [Member] | Cash and cash equivalents | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Plans | Pension Plan [Member] | Cash and cash equivalents | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Plans | Pension Plan [Member] | Other
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	(976,000,000)	(953,000,000)
U.S. Plans | Pension Plan [Member] | Other | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	(976,000,000)	(953,000,000)
U.S. Plans | Pension Plan [Member] | Other | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Plans | Pension Plan [Member] | Other | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. Plans | Pension Plan [Member] | Other | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 0	0
Non-U.S. Plans [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on assets	4.18%
Defined Benefit Plan Fair Value Of Plan Assets Dividends And Interest Receivable	$ 115,000,000	106,000,000
Defined Benefit Plan, Plan Assets, Amount	27,273,000,000	29,657,000,000	$ 25,549,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	1,142,000,000	3,092,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	18,639,000,000	18,570,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	5,249,000,000	5,633,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	2,243,000,000	2,362,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | Equity
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	2,278,000,000	3,497,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | Equity | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	2,040,000,000	2,926,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | Equity | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	237,000,000	571,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | Equity | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	1,000,000	0
Non-U.S. Plans [Member] | Pension Plan [Member] | Equity | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | U.S. companies
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	1,249,000,000	1,736,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | U.S. companies | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	1,146,000,000	1,593,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | U.S. companies | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	103,000,000	143,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | U.S. companies | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | U.S. companies | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | International companies
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	1,029,000,000	1,761,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | International companies | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	894,000,000	1,333,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | International companies | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	134,000,000	428,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | International companies | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	1,000,000	0
Non-U.S. Plans [Member] | Pension Plan [Member] | International companies | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	18,830,000,000	18,492,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | Fixed Income | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	428,000,000	493,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | Fixed Income | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	18,402,000,000	17,999,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | Fixed Income | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | Fixed Income | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | U.S. government
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	563,000,000	593,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | U.S. government | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	415,000,000	495,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | U.S. government | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	148,000,000	98,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | U.S. government | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | U.S. government | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | Non-U.S. government
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	14,871,000,000	14,088,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | Non-U.S. government | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | Non-U.S. government | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	14,871,000,000	14,088,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | Non-U.S. government | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | Non-U.S. government | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	2,875,000,000	3,217,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | Corporate bonds | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | Corporate bonds | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	2,875,000,000	3,217,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | Corporate bonds | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | Corporate bonds | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | Mortgage/other asset-backed
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	286,000,000	301,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | Mortgage/other asset-backed | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | Mortgage/other asset-backed | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	286,000,000	301,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | Mortgage/other asset-backed | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | Mortgage/other asset-backed | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | Commingled funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	268,000,000	251,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | Commingled funds | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | Commingled funds | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	268,000,000	251,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | Commingled funds | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | Commingled funds | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | Fixed Income Funds Net Derivative Financial Instruments [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	(33,000,000)	42,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | Fixed Income Funds Net Derivative Financial Instruments [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	13,000,000	(2,000,000)
Non-U.S. Plans [Member] | Pension Plan [Member] | Fixed Income Funds Net Derivative Financial Instruments [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	(46,000,000)	44,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | Fixed Income Funds Net Derivative Financial Instruments [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | Fixed Income Funds Net Derivative Financial Instruments [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | Repurchase Agreements [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	(1,400,000,000)	(181,000,000)
Non-U.S. Plans [Member] | Pension Plan [Member] | Alternatives
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	2,243,000,000	2,362,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | Alternatives | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | Alternatives | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | Alternatives | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | Alternatives | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	2,243,000,000	2,362,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	1,143,000,000	1,179,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | Hedge funds | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | Hedge funds | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | Hedge funds | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | Hedge funds | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	1,143,000,000	1,179,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | Private equity
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	687,000,000	722,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | Private equity | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | Private equity | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | Private equity | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | Private equity | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	687,000,000	722,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | Real estate
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	413,000,000	461,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | Real estate | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | Real estate | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | Real estate | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | Real estate | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	413,000,000	461,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	(641,000,000)	388,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | Cash and cash equivalents | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	(641,000,000)	388,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | Cash and cash equivalents | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | Cash and cash equivalents | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | Cash and cash equivalents | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | Other
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	4,563,000,000	4,918,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | Other | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	(685,000,000)	(715,000,000)
Non-U.S. Plans [Member] | Pension Plan [Member] | Other | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | Other | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	5,248,000,000	5,633,000,000
Non-U.S. Plans [Member] | Pension Plan [Member] | Other | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. Plans [Member] | Pension Plan [Member] | Ford Werke GmbH [Member] | Other Pension Benefit Plan Asset Insurance Contracts [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 4,300,000,000	$ 4,800,000,000
Canada | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on assets	5.00%
United Kingdom | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on assets	4.25%