Annual report pursuant to Section 13 and 15(d)

SUMMARY OF ACCOUNTING POLICIES - Income Statement Impact (Details)

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SUMMARY OF ACCOUNTING POLICIES - Income Statement Impact (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Revenue $ 20,568 $ 18,318 $ 18,048 $ 17,160 $ 19,848 $ 17,444 $ 17,456 $ 17,113 $ 74,094 $ 71,861 $ 66,585
Operating Expenses:                      
Compensation and benefits                 38,908 37,235 34,577
Depreciation and amortization                 2,360 2,207 2,282
Fuel                 3,289 3,427 2,690
Other occupancy                 1,392 1,362 1,155
Other expenses                 5,919 5,465 5,055
Total Operating Expenses                 66,296 64,837 59,056
Operating Profit 2,133 2,128 2,143 1,394 2,004 1,727 1,773 1,520 7,798 7,024 7,529
Other Income and (Expense):                      
Investment income (expense) and other                 (1,493) (400) 61
Interest expense                 (653) (605) (453)
Total Other Income and (Expense) (2,331) 78 61 46 (1,461) 162 153 141 (2,146) (1,005) (392)
Income Before Income Taxes                 5,652 6,019 7,137
Income Tax Expense                 1,212 1,228 2,232
Net Income $ (106) $ 1,750 $ 1,685 $ 1,111 $ 453 $ 1,508 $ 1,485 $ 1,345 $ 4,440 $ 4,791 $ 4,905
Basic Earnings Per Share (in dollars per share) $ (0.12) $ 2.03 $ 1.95 $ 1.28 $ 0.52 $ 1.74 $ 1.71 $ 1.55 $ 5.14 $ 5.53 $ 5.63
Diluted Earnings Per Share (in dollars per share) $ (0.12) $ 2.01 $ 1.94 $ 1.28 $ 0.52 $ 1.73 $ 1.71 $ 1.55 $ 5.11 $ 5.51 $ 5.61
As Previously Reported                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Revenue                     $ 65,872
Operating Expenses:                      
Compensation and benefits                     34,588
Depreciation and amortization                     2,282
Fuel                     2,690
Other occupancy                     1,155
Other expenses                     5,039
Total Operating Expenses                     58,343
Operating Profit                     7,529
Other Income and (Expense):                      
Investment income (expense) and other                     72
Interest expense                     (453)
Total Other Income and (Expense)                     (381)
Income Before Income Taxes                     7,148
Income Tax Expense                     2,238
Net Income                     $ 4,910
Basic Earnings Per Share (in dollars per share)                     $ 5.64
Diluted Earnings Per Share (in dollars per share)                     $ 5.61
Adjustments                      
Other Income and (Expense):                      
Income Tax Expense                     $ (71)
ASU 2014-09 | Adjustments                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Revenue                     713
Operating Expenses:                      
Other expenses                     16
Total Operating Expenses                     724
Operating Profit                     (11)
Other Income and (Expense):                      
Income Before Income Taxes                     (11)
Income Tax Expense                     (6)
Net Income                     $ (5)
Basic Earnings Per Share (in dollars per share)                     $ (0.01)
Diluted Earnings Per Share (in dollars per share)                     $ 0
ASU 2017-07 | Adjustments                      
Operating Expenses:                      
Compensation and benefits                     $ (11)
Total Operating Expenses                     (11)
Operating Profit                     11
Other Income and (Expense):                      
Investment income (expense) and other                     (11)
Total Other Income and (Expense)                     (11)
Repairs and maintenance                      
Other Income and (Expense):                      
Repairs and maintenance                 $ 1,838 $ 1,732 1,601
Repairs and maintenance | As Previously Reported                      
Other Income and (Expense):                      
Repairs and maintenance                     1,600
Repairs and maintenance | ASU 2014-09 | Adjustments                      
Other Income and (Expense):                      
Repairs and maintenance                     1
Purchased transportation                      
Other Income and (Expense):                      
Repairs and maintenance                 $ 12,590 $ 13,409 11,696
Purchased transportation | As Previously Reported                      
Other Income and (Expense):                      
Repairs and maintenance                     10,989
Purchased transportation | ASU 2014-09 | Adjustments                      
Other Income and (Expense):                      
Repairs and maintenance                     $ 707