Income Taxes (Deferred Income Tax Assets And Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Accrued expenses not currently deductible	$ 547	$ 492
Differences related to non-U.S. operations	294	324
Accrued U.S. retirement benefits	494	438
Net operating losses	60	70
Income currently recognized for tax	25	19
Other	43	27
Deferred tax assets	1,463	1,370
Deferred tax liabilities:
Differences related to non-U.S. operations	569	400
Depreciation and amortization	491	594
Accrued retirement & postretirement benefits - non-U.S. operations	143	151
Capitalized expenses currently recognized for tax	87	77
Other	32	37
Deferred tax liabilities	1,322	1,259
Balance sheet classifications:
Deferred tax assets	702	676
Deferred Tax Assets Related to Differences Related to Non-U.S. Operations
Deferred tax liabilities:
Valuation allowance	123	54
Deferred Tax Assets Related To Net Operating Loss
Deferred tax liabilities:
Valuation allowance	75	72
Other Noncurrent Assets
Balance sheet classifications:
Deferred tax assets	702	676
Other Noncurrent Liabilities
Balance sheet classifications:
Other liabilities	$ 561	$ 565