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Income, Sales-Based And Other Taxes (Schedule Of Income, Sales-Based And Other Taxes) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income, Sales-Based and Other Taxes [Line Items]      
Current $ 7,126 $ 16,211 $ 23,188
Deferred - net (1,737) 2,298 641
U.S. tax on non-U.S. operations 38 5 37
Total federal and non-U.S. 5,427 18,514 23,866
State (12) (499) [1] 397
Total income tax expense 5,415 18,015 24,263
Sales-based taxes [2] 22,678 29,342 30,589
Other taxes and duties 27,265 32,286 33,230
Other taxes and duties included in production and manufacturing expenses 1,985 2,633 2,500
Other taxes and duties included in SG&A expenses 540 596 666
Total other taxes and duties 29,790 35,515 36,396
Total 57,883 82,872 91,248
U.S. [Member]      
Income, Sales-Based and Other Taxes [Line Items]      
Current   1,456 1,073
Deferred - net (1,166) 900 (116)
U.S. tax on non-U.S. operations 38 5 37
Total federal and non-U.S. (1,128) 2,361 994
State (12) (499) [1] 397
Total income tax expense (1,140) 1,862 1,391
Sales-based taxes 6,402 6,310 5,992
Other taxes and duties 162 378 955
Other taxes and duties included in production and manufacturing expenses 1,157 1,454 1,318
Other taxes and duties included in SG&A expenses 150 155 150
Total other taxes and duties 1,469 1,987 2,423
Total 6,731 10,159 9,806
U.S. [Member] | State Tax Adjustment [Member]      
Income, Sales-Based and Other Taxes [Line Items]      
Deferred tax adjustment included in State Taxes   830  
Non-U.S. [Member]      
Income, Sales-Based and Other Taxes [Line Items]      
Current 7,126 14,755 22,115
Deferred - net (571) 1,398 757
Total federal and non-U.S. 6,555 16,153 22,872
Total income tax expense 6,555 16,153 22,872
Sales-based taxes 16,276 23,032 24,597
Other taxes and duties 27,103 31,908 32,275
Other taxes and duties included in production and manufacturing expenses 828 1,179 1,182
Other taxes and duties included in SG&A expenses 390 441 516
Total other taxes and duties 28,321 33,528 33,973
Total $ 51,152 $ 72,713 $ 81,442
[1] In 2014, state taxes included a favorable adjustment of deferred taxes of approximately $830 million.
[2] Sales and other operating revenue includes sales-based taxes of $22,678 million for 2015, $29,342 million for 2014 and $30,589 million for 2013.