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Revision of Prior Period Financial Statements - Schedule of Consolidated Income (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
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Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2024 | [1] | Jun. 30, 2023 | Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Labor and Fringe | $ 766 |  | $ 805 |  | $ 814 | $ 761 | $ 748 | [1] | $ 729 |  | $ 1,571 | $ 1,477 | [1] | $ 2,238 | $ 3,052 | $ 2,885
Purchased Services and Other | 699 |  | 721 |  | 714 | 700 | 691 | [1] | 697 |  | 1,420 | 1,388 | [1] | 2,088 | 2,802 | 2,728
Depreciation and Amortization | 410 |  |  |  | 405 | 403 | 404 | [1] | 395 |  | 820 | 799 | [2] | 1,202 | 1,607 | 1,502
Total Expense | 2,253 |  | 2,344 |  | 2,365 | 2,301 | 2,233 | [1] | 2,259 |  | 4,597 | 4,492 | [1] | 6,793 | 9,158 | 8,899
Operating Income | 1,448 |  | 1,337 |  | 1,315 | 1,271 | 1,466 | [1] | 1,447 |  | 2,785 | 2,913 | [1] | 4,184 | 5,499 | 5,954
Earnings Before Income Taxes | 1,267 |  | 1,168 |  | 1,144 | 1,102 | 1,296 | [1] | 1,287 |  | 2,435 | 2,583 | [1] | 3,685 | 4,829 | 5,345
Income Tax Expense | (304) |  | (288) |  | (262) | (274) | (312) | [1] | (313) |  | (592) | (625) | [1] | (899) | (1,161) | (1,231)
Net Earnings | $ 963 | [3] | $ 880 | [3] | $ 882 | $ 828 | $ 984 | [1] | $ 974 | [4] | $ 1,843 | $ 1,958 | [1] | $ 2,786 | $ 3,668 | $ 4,114
Net Earnings Per Share, Basic (in dollars per share) | $ 0.50 |  | $ 0.45 |  | $ 0.45 | $ 0.42 | $ 0.49 | [1] | $ 0.47 |  | $ 0.94 | $ 0.96 | [1] | $ 1.38 | $ 1.83 | $ 1.93
Net Earnings Per Share, Assuming Dilution (in dollars per share) | $ 0.49 |  | $ 0.45 |  | $ 0.45 | $ 0.41 | $ 0.49 | [1] | $ 0.47 |  | $ 0.94 | $ 0.96 | [1] | $ 1.37 | $ 1.82 | $ 1.92
Total Comprehensive Earnings (Note 10) | $ 966 | [3] | $ 886 | [3] | $ 997 | $ 846 | $ 980 | [1] | $ 976 | [4] | $ 1,852 | $ 1,956 | [1] | $ 2,802 | $ 3,799 | $ 4,080
As Previously Reported |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Labor and Fringe |  |  | 798 |  | 808 | 752 | 741 |  | 723 |  |  | 1,464 |  | 2,216 | 3,024 | 2,861
Purchased Services and Other |  |  | 711 |  | 703 | 689 | 684 |  | 688 |  |  | 1,372 |  | 2,061 | 2,764 | 2,685
Depreciation and Amortization |  |  |  |  | 417 | 399 | 402 |  | 393 |  |  | 795 |  | 1,194 | 1,611 | 1,500
Total Expense |  |  | 2,327 |  | 2,360 | 2,277 | 2,217 |  | 2,242 |  |  | 4,459 |  | 6,736 | 9,096 | 8,830
Operating Income |  |  | 1,354 |  | 1,320 | 1,295 | 1,482 |  | 1,464 |  |  | 2,946 |  | 4,241 | 5,561 | 6,023
Earnings Before Income Taxes |  |  | 1,185 |  | 1,149 | 1,126 | 1,312 |  | 1,304 |  |  | 2,616 |  | 3,742 | 4,891 | 5,414
Income Tax Expense |  |  | (292) |  | (263) | (280) | (316) |  | (317) |  |  | (633) |  | (913) | (1,176) | (1,248)
Net Earnings |  |  | $ 893 |  | $ 886 | $ 846 | $ 996 |  | $ 987 |  |  | $ 1,983 |  | $ 2,829 | $ 3,715 | $ 4,166
Net Earnings Per Share, Basic (in dollars per share) |  |  | $ 0.46 |  | $ 0.45 | $ 0.42 | $ 0.49 |  | $ 0.48 |  |  | $ 0.97 |  | $ 1.40 | $ 1.85 | $ 1.95
Net Earnings Per Share, Assuming Dilution (in dollars per share) |  |  | $ 0.46 |  | $ 0.45 | $ 0.42 | $ 0.49 |  | $ 0.48 |  |  | $ 0.97 |  | $ 1.40 | $ 1.85 | $ 1.95
Total Comprehensive Earnings (Note 10) |  |  | $ 899 |  | $ 946 | $ 864 | $ 992 |  | $ 989 |  |  | $ 1,981 |  | $ 2,845 | $ 3,791 | $ 4,186
Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Labor and Fringe |  |  | 7 |  | 6 | 9 | 7 |  | 6 |  |  | 13 |  | 22 | 28 | 24
Purchased Services and Other |  |  | 10 |  | 11 | 11 | 7 |  | 9 |  |  | 16 |  | 27 | 38 | 43
Depreciation and Amortization |  |  |  |  | (12) | 4 | 2 |  | 2 |  |  | 4 |  | 8 | (4) | 2
Total Expense |  |  | 17 |  | 5 | 24 | 16 |  | 17 |  |  | 33 |  | 57 | 62 | 69
Operating Income |  |  | (17) |  | (5) | (24) | (16) |  | (17) |  |  | (33) |  | (57) | (62) | (69)
Earnings Before Income Taxes |  |  | (17) |  | (5) | (24) | (16) |  | (17) |  |  | (33) |  | (57) | (62) | (69)
Income Tax Expense |  |  | 4 |  | 1 | 6 | 4 |  | 4 |  |  | 8 |  | 14 | 15 | 17
Net Earnings |  |  | $ (13) |  | $ (4) | $ (18) | $ (12) |  | $ (13) |  |  | $ (25) |  | $ (43) | $ (47) | $ (52)
Net Earnings Per Share, Basic (in dollars per share) |  |  | $ (0.01) |  | $ 0 | $ 0 | $ 0 |  | $ (0.01) |  |  | $ (0.01) |  | $ (0.02) | $ (0.02) | $ (0.02)
Net Earnings Per Share, Assuming Dilution (in dollars per share) |  |  | $ (0.01) |  | $ 0 | $ (0.01) | $ 0 |  | $ (0.01) |  |  | $ (0.01) |  | $ (0.03) | $ (0.03) | $ (0.03)
Total Comprehensive Earnings (Note 10) |  |  | $ (13) |  | $ 51 | $ (18) | $ (12) |  | $ (13) |  |  | $ (25) |  | $ (43) | $ 8 | $ (106)
[1] | See Note 11, Revision of Prior Period Financial Statements.
[2] | See Note 11, Revision of Prior Period Financial Statements.
[3] | See Note 11, Revision of Prior Period Financial Statements.
[4] | See Note 11, Revision of Prior Period Financial Statements.

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