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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

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