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Revision of Prior Period Financial Statements - Schedule of Consolidated Cash Flow Statements (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Jun. 30, 2024
 [1]
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
OPERATING ACTIVITIES                        
Net Earnings $ 894 [1] $ 963 $ 880 [1] $ 882 $ 828 [2] $ 984 [3] $ 974 [3] $ 1,958 $ 2,737 [2] $ 2,786 [2] $ 3,668 $ 4,114
Depreciation and Amortization 416     405 403 [2] 404 395 799 1,236 [2] 1,202 [2] 1,607 1,502
Deferred Income Taxes     7       31 70 19 [4] 97 [4] 126 100
Other Operating Activities     (16)       (35) 18 (35) [4] 67 [4] (7) (16)
Changes in Other Current Assets             (73) (106) 27 [4] (84) [4] (112) (24)
Changes in Income and Other Taxes Payable             266 33 (148) [4] 267 [4] 430 88
Changes in Other Current Liabilities             (301) (267) (33) [4] (271) [4] (196)  
Net Cash Provided by Operating Activities     1,066       1,256 2,473 3,859 [4] 4,025 [4] 5,514 5,526
INVESTING ACTIVITIES                        
Property Additions     (517)       (432) (997) (1,691) [4] (1,571) [4] (2,257) (2,113)
Proceeds and Advances from Property Dispositions     11       17 52 50 [4] 65 [4] 88 294
Net Cash Used In Investing Activities     (486)       (460) (945) (1,722) [4] (1,506) [4] (2,227) (2,063)
Net Increase (Decrease) in Cash and Cash Equivalents             (642) (977) 291 [4] (573) [4] (580) (306)
CASH AND CASH EQUIVALENTS                        
Cash and Cash Equivalents at Beginning of Period     1,353 [5] 1,360 [4] 956 1,291 1,933 [4] 1,933 [4] 1,353 [5] 1,933 [4] 1,933 [4] 2,239
Cash and Cash Equivalents at End of Period $ 1,644 [4]     1,353 [5] 1,360 [4] 956 1,291 956 1,644 [4] 1,360 [4] 1,353 [5] 1,933 [4]
As Previously Reported                        
OPERATING ACTIVITIES                        
Net Earnings     893 886 846 996 987 1,983   2,829 3,715 4,166
Depreciation and Amortization       417 399 402 393 795   1,194 1,611 1,500
Deferred Income Taxes     11       35 78   111 140 117
Other Operating Activities     (15)       (31) 23   69 (5) (17)
Changes in Other Current Assets             (72) (105)   (86) (120) (22)
Changes in Income and Other Taxes Payable             266 33   267 431 113
Changes in Other Current Liabilities             (326) (292)   (296) (221)  
Net Cash Provided by Operating Activities     1,084       1,251 2,483   4,049 5,549 5,619
INVESTING ACTIVITIES                        
Property Additions     (524)       (443) (1,015)   (1,590) (2,281) (2,133)
Proceeds and Advances from Property Dispositions     0       8 35   35 52 246
Net Cash Used In Investing Activities     (504)       (480) (980)   (1,555) (2,287) (2,131)
Net Increase (Decrease) in Cash and Cash Equivalents             (667) (1,002)   (598) (605) (281)
CASH AND CASH EQUIVALENTS                        
Cash and Cash Equivalents at Beginning of Period     1,353 1,360 956 1,291 1,958 1,958 1,353 1,958 1,958 2,239
Cash and Cash Equivalents at End of Period       1,353 1,360 956 1,291 956   1,360 1,353 1,958
Adjustment                        
OPERATING ACTIVITIES                        
Net Earnings     (13) (4) (18) (12) (13) (25)   (43) (47) (52)
Depreciation and Amortization       (12) 4 2 2 4   8 (4) 2
Deferred Income Taxes     (4)       (4) (8)   (14) (14) (17)
Other Operating Activities     (1)       (4) (5)   (2) (2) 1
Changes in Other Current Assets             (1) (1)   2 8 (2)
Changes in Income and Other Taxes Payable             0 0   0 (1) (25)
Changes in Other Current Liabilities             25 25   25 25  
Net Cash Provided by Operating Activities     (18)       5 (10)   (24) (35) (93)
INVESTING ACTIVITIES                        
Property Additions     7       11 18   19 24 20
Proceeds and Advances from Property Dispositions     11       9 17   30 36 48
Net Cash Used In Investing Activities     18       20 35   49 60 68
Net Increase (Decrease) in Cash and Cash Equivalents             25 25   25 25 (25)
CASH AND CASH EQUIVALENTS                        
Cash and Cash Equivalents at Beginning of Period     $ 0 0 0 0 (25) (25) $ 0 (25) (25) 0
Cash and Cash Equivalents at End of Period       $ 0 $ 0 $ 0 $ 0 $ 0   $ 0 $ 0 $ (25)
[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.
[5] See Note 11, Revision of Prior Period Financial Statements.