Quarterly report pursuant to Section 13 or 15(d)

RECENT ACCOUNTING PRONOUNCEMENTS - Income Statement Impact (Details)

v3.8.0.1
RECENT ACCOUNTING PRONOUNCEMENTS - Income Statement Impact (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Revenue $ 17,113 $ 15,510
Operating Expenses:    
Compensation and benefits 9,045 8,311
Repairs and maintenance 434 390
Depreciation and amortization 596 554
Purchased transportation 3,145 2,545
Fuel 750 621
Other occupancy 361 299
Other expenses 1,262 1,173
Operating expenses 15,593 13,893
Operating Profit 1,520 1,617
Other Income and (Expense):    
Investment income and other 294 195
Interest expense (153) (102)
Total Other Income and (Expense) 141 93
Income Before Income Taxes 1,661 1,710
Income Tax Expense 316 544
Net Income $ 1,345 $ 1,166
Basic Earnings Per Share $ 1.55 $ 1.33
Diluted Earnings Per Share $ 1.55 $ 1.33
Previously Reported    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Revenue   $ 15,315
Operating Expenses:    
Compensation and benefits   8,131
Repairs and maintenance   390
Depreciation and amortization   554
Purchased transportation   2,366
Fuel   621
Other occupancy   299
Other expenses   1,170
Operating expenses   13,531
Operating Profit   1,784
Other Income and (Expense):    
Investment income and other   15
Interest expense   (102)
Total Other Income and (Expense)   (87)
Income Before Income Taxes   1,697
Income Tax Expense   539
Net Income   $ 1,158
Basic Earnings Per Share   $ 1.32
Diluted Earnings Per Share   $ 1.32
Restatement | ASU 2014-09    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Revenue   $ 195
Operating Expenses:    
Compensation and benefits   0
Repairs and maintenance   0
Depreciation and amortization   0
Purchased transportation   179
Fuel   0
Other occupancy   0
Other expenses   3
Operating expenses   182
Operating Profit   13
Other Income and (Expense):    
Investment income and other   0
Interest expense   0
Total Other Income and (Expense)   0
Income Before Income Taxes   13
Income Tax Expense   5
Net Income   $ 8
Basic Earnings Per Share   $ 0.01
Diluted Earnings Per Share   $ 0.01
Restatement | ASU 2017-07    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Revenue   $ 0
Operating Expenses:    
Compensation and benefits   180
Repairs and maintenance   0
Depreciation and amortization   0
Purchased transportation   0
Fuel   0
Other occupancy   0
Other expenses   0
Operating expenses   180
Operating Profit   (180)
Other Income and (Expense):    
Investment income and other   180
Interest expense   0
Total Other Income and (Expense)   180
Income Before Income Taxes   0
Income Tax Expense   0
Net Income   $ 0
Basic Earnings Per Share   $ 0.00
Diluted Earnings Per Share   $ 0.00