Pensions And Other Postretirement Benefits Contributions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Employer Contributions to Defined Contribution Plans	$ 535	$ 513	$ 502
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Years of Service	30 years
Employer contributions	$ 1,215	913	1,014
U.S. non-qualified pension plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Employer Contributions in Next Fiscal Year	71
Non-US Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Employer Contributions in Next Fiscal Year	947
Employer contributions	1,120	770	886
U.S. hourly pension plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated Future Employer Contributions in Next Fiscal Year	2,000
U.S. hourly and salaried pension plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	95	143	128
US OPEB Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 340	$ 354	$ 393