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Acquisitions - Schedule of Assets Acquired and Liabilities Assumed - Andeavor (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018 | Oct. 01, 2018
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Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 21,277 | $ 20,184 |
Andeavor |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash and cash equivalents |  |  |  | $ 382
Receivables |  |  |  | 2,737
Inventories |  |  |  | 5,241
Other current assets |  |  |  | 372
Equity method investments |  |  |  | 752
Property, plant and equipment, net |  |  |  | 15,486
Other noncurrent assets | [1] |  |  | 3,075
Total assets acquired |  |  |  | 28,045
Accounts payable |  |  |  | 3,962
Payroll and benefits payable |  |  |  | 357
Accrued taxes |  |  |  | 480
Debt due within one year |  |  |  | 34
Other current liabilities |  |  |  | 419
Long-term debt |  |  |  | 8,876
Deferred income taxes |  |  |  | 1,549
Defined benefit postretirement plan obligations |  |  |  | 432
Deferred credit and other liabilities |  |  |  | 747
Noncontrolling interests |  |  |  | 5,062
Total liabilities and noncontrolling interest assumed |  |  |  | 21,918
Net assets acquired excluding goodwill |  |  |  | 6,127
Goodwill |  |  |  | 17,335
Net assets acquired |  |  |  | 23,462
Andeavor | As originally reported |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash and cash equivalents |  |  |  | 382
Receivables |  |  |  | 2,744
Inventories |  |  |  | 5,204
Other current assets |  |  |  | 378
Equity method investments |  |  |  | 865
Property, plant and equipment, net |  |  |  | 16,545
Other noncurrent assets | [1] |  |  | 3,086
Total assets acquired |  |  |  | 29,204
Accounts payable |  |  |  | 4,003
Payroll and benefits payable |  |  |  | 348
Accrued taxes |  |  |  | 590
Debt due within one year |  |  |  | 34
Other current liabilities |  |  |  | 392
Long-term debt |  |  |  | 8,875
Deferred income taxes |  |  |  | 1,609
Defined benefit postretirement plan obligations |  |  |  | 432
Deferred credit and other liabilities |  |  |  | 714
Noncontrolling interests |  |  |  | 5,059
Total liabilities and noncontrolling interest assumed |  |  |  | 22,056
Net assets acquired excluding goodwill |  |  |  | 7,148
Goodwill |  |  |  | 16,314
Net assets acquired |  |  |  | 23,462
Andeavor | Adjustments |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash and cash equivalents |  |  |  | 0
Receivables |  |  |  | (7)
Inventories |  |  |  | 37
Other current assets |  |  |  | (6)
Equity method investments |  |  |  | (113)
Property, plant and equipment, net |  |  |  | (1,059)
Other noncurrent assets | [1] |  |  | (11)
Total assets acquired |  |  |  | (1,159)
Accounts payable |  |  |  | (41)
Payroll and benefits payable |  |  |  | 9
Accrued taxes |  |  |  | (110)
Debt due within one year |  |  |  |
Other current liabilities |  |  |  | 27
Long-term debt |  |  |  | 1
Deferred income taxes |  |  |  | (60)
Defined benefit postretirement plan obligations |  |  |  | 0
Deferred credit and other liabilities |  |  |  | 33
Noncontrolling interests |  |  |  | 3
Total liabilities and noncontrolling interest assumed |  |  |  | (138)
Net assets acquired excluding goodwill |  |  |  | (1,021)
Goodwill |  | $ 32 |  | 1,021
Net assets acquired |  |  |  | $ 0
[1] | Includes intangible assets

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