Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Narrative that provides an understanding of significant concentrations of risk within plan assets.

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Employee Postretirement Benefits (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2028
Defined Benefit Plan, Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate		2028
Defined Contribution Plan, Cost		$ 120	$ 128	$ 126
Scenario, Forecast
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year	5.80%
Defined Benefit Plan, Health Care Cost Trend Rate Assumed For Ultimate Fiscal Year					4.50%
U.S. Pension Plan
Derivative, Notional Amount		281	225
U.K. Pension Plan
Derivative, Notional Amount		287	272
Principal Plans
Defined Benefit Plan, Benefit Obligation		$ 3,094	$ 3,567
Weighted-average expected long-term rate or return		4.75%	4.72%	5.10%
Defined Benefit Plan, Significant Concentrations of Risk		there were no significant concentrations of equity or debt securities in any single issuer or industry.
Principal Plans \| Scenario, Forecast
Weighted-average expected long-term rate or return	4.59%
Defined Benefit Pension Plans
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement		$ (136)	$ (7)	$ (1)
Defined Benefit Plan, Benefit Obligation		3,687	4,296	$ 4,126
Employer contributions		$ 166	$ 53
Weighted-average expected long-term rate or return		4.50%	4.46%	4.84%
Defined Benefit Pension Plans \| Scenario, Forecast
Weighted-average expected long-term rate or return	4.39%
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	$ 25
Equity Securities \| Principal Plans \| Scenario, Forecast
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	20.00%
2018 Global Restructuring Program
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement		$ (110)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment		$ (17)
Fixed Income Funds \| Principal Plans \| Scenario, Forecast
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	80.00%