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General and Summary of Significant Accounting Policies Change in Accounting Estimate (Details) - USD ($) $ in Millions | Jan. 01, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2019
--- | --- | --- | --- | ---
Change in Accounting Estimate [Line Items] |  |  |  |
Accounts receivable, net of allowance for doubtful accounts of $13 and $20, respectively | $ 1,479 | $ 1,300 | $ 1,479 |
Other Assets, Current | (800) | (726) | (802) |
Accounts and Financing Receivable, after Allowance for Credit Loss, Noncurrent | (1,319) |  | (1,351) |
Other Assets, Noncurrent | (1,605) | (1,660) | (1,635) | $ (1,767)
Retained Earnings (Accumulated Deficit) | (731) | (680) | (692) |
Stockholders' Equity Attributable to Noncontrolling Interest | 2,217 | 2,086 | 2,233 |
Loans and Leases Receivable, Allowance | 32 | 0 | 0 |
Accounts Receivable, Allowance for Credit Loss, Current | 20 | 13 | 20 |
Accounts and Financing Receivable, Allowance for Credit Loss | 68 | 62 |  |
Other Current Assets [Member] |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |
Deferred Income Tax Assets, Net | $ 165 |  | $ 156 |
Mong Duong Subsidiary [Member] |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |
Accounts and Financing Receivable, Allowance for Credit Loss |  | $ 32 |  |
Accounting Standards Update 2016-13 [Member] | Mong Duong Subsidiary [Member] |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |
Financing Receivable, Credit Loss Rate | 2.40% |  |  |
Accounts and Financing Receivable, Allowance for Credit Loss | $ 34 |  |  |
Accounting Standards Update 2016-13 [Member] |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |
Accounts receivable, net of allowance for doubtful accounts of $13 and $20, respectively | 0 |  |  |
Other Assets, Current | (2) |  |  |
Deferred Income Tax Assets, Net | 9 |  |  |
Accounts and Financing Receivable, after Allowance for Credit Loss, Noncurrent | (32) |  |  |
Other Assets, Noncurrent | (30) |  |  |
Retained Earnings (Accumulated Deficit) | (39) |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest | $ (16) |  |  |

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