Annual report pursuant to Section 13 and 15(d)

SUMMARY OF ACCOUNTING POLICIES - Income Statement Impact (Details)

v3.10.0.1
SUMMARY OF ACCOUNTING POLICIES - Income Statement Impact (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Revenue $ 19,848 $ 17,444 $ 17,456 $ 17,113 $ 18,975 $ 16,173 $ 15,927 $ 15,510 $ 71,861 $ 66,585 $ 61,610
Operating Expenses:                      
Compensation and benefits                 37,235 34,577 32,534
Depreciation and amortization                 2,207 2,282 2,224
Fuel                 3,427 2,690 2,118
Other occupancy                 1,362 1,155 1,037
Other expenses                 5,465 5,055 4,619
Total Operating Expenses                 64,837 59,056 53,922
Operating Profit 2,004 1,727 1,773 1,520 2,063 1,812 2,037 1,617 7,024 7,529 7,688
Other Income and (Expense):                      
Investment income and other                 (400) 61 (2,186)
Interest expense                 (605) (453) (381)
Total Other Income and (Expense) (1,461) 162 153 141 (692) 125 82 93 (1,005) (392) (2,567)
Income Before Income Taxes                 6,019 7,137 5,121
Income Tax Expense                 1,228 2,232 1,699
Net Income $ 453 $ 1,508 $ 1,485 $ 1,345 $ 1,096 $ 1,259 $ 1,384 $ 1,166 $ 4,791 $ 4,905 $ 3,422
Basic Earnings Per Share (in dollars per share) $ 0.52 $ 1.74 $ 1.71 $ 1.55 $ 1.26 $ 1.45 $ 1.59 $ 1.33 $ 5.53 $ 5.63 $ 3.88
Diluted Earnings Per Share (in dollars per share) $ 0.52 $ 1.73 $ 1.71 $ 1.55 $ 1.26 $ 1.44 $ 1.58 $ 1.33 $ 5.51 $ 5.61 $ 3.86
As Previously Reported                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Revenue                   $ 65,872 $ 60,906
Operating Expenses:                      
Compensation and benefits                   34,588 34,770
Depreciation and amortization                   2,282 2,224
Fuel                   2,690 2,118
Other occupancy                   1,155 1,037
Other expenses                   5,039 4,623
Total Operating Expenses                   58,343 55,439
Operating Profit                   7,529 5,467
Other Income and (Expense):                      
Investment income and other                   72 50
Interest expense                   (453) (381)
Total Other Income and (Expense)                   (381) (331)
Income Before Income Taxes                   7,148 5,136
Income Tax Expense                   2,238 1,705
Net Income                   $ 4,910 $ 3,431
Basic Earnings Per Share (in dollars per share)                   $ 5.64 $ 3.89
Diluted Earnings Per Share (in dollars per share)                   $ 5.61 $ 3.87
Adjustments                      
Other Income and (Expense):                      
Income Tax Expense                 $ (38) $ (71)  
ASU 2014-09 | Adjustments                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Revenue                   713 $ 704
Operating Expenses:                      
Other expenses                   16 (4)
Total Operating Expenses                   724 719
Operating Profit                   (11) (15)
Other Income and (Expense):                      
Income Before Income Taxes                   (11) (15)
Income Tax Expense                   (6) (6)
Net Income                   $ (5) $ (9)
Basic Earnings Per Share (in dollars per share)                   $ (0.01) $ (0.01)
Diluted Earnings Per Share (in dollars per share)                   $ 0 $ 0
ASU 2017-07 | Adjustments                      
Operating Expenses:                      
Compensation and benefits                   $ (11) $ (2,236)
Total Operating Expenses                   (11) (2,236)
Operating Profit                   11 2,236
Other Income and (Expense):                      
Investment income and other                   (11) (2,236)
Interest expense                     0
Total Other Income and (Expense)                   (11) (2,236)
Repairs and maintenance                      
Other Income and (Expense):                      
Repairs and maintenance                 1,732 1,601 1,542
Repairs and maintenance | As Previously Reported                      
Other Income and (Expense):                      
Repairs and maintenance                   1,600 1,538
Repairs and maintenance | ASU 2014-09 | Adjustments                      
Other Income and (Expense):                      
Repairs and maintenance                   1 4
Purchased transportation                      
Other Income and (Expense):                      
Repairs and maintenance                 $ 13,409 11,696 9,848
Purchased transportation | As Previously Reported                      
Other Income and (Expense):                      
Repairs and maintenance                   10,989 9,129
Purchased transportation | ASU 2014-09 | Adjustments                      
Other Income and (Expense):                      
Repairs and maintenance                   $ 707 $ 719