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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Significant Accounting Policies [Abstract] |
Restrictions on Cash and Cash Equivalents [Table Text Block] | The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the Consolidated Statements of Financial Position that sum to the total of the same such amounts shown on the Consolidated Statements of Cash Flows:
Millions |  | 2020 | 2019 | 2018
Cash and cash equivalents | $ | 1,799 | $ | 831 | $ | 1,273
Restricted cash equivalents in other current assets |  | 7 |  | 13 |  | 42
Restricted cash equivalents in other assets |  | 12 |  | 12 |  | 13
Total cash, cash equivalents, and restricted cash ‎equivalents shown on the Statement of Cash Flows: | $ | 1,818 | $ | 856 | $ | 1,328

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