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Accounting Policies - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] | true |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date | Jan. 01, 2020 |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member | us-gaap:AccountingStandardsUpdate201602Member | us-gaap:AccountingStandardsUpdate201409Member |  |
Retained earnings | $ 4,809 | $ 6,113 |  |  |
Accounts receivable | 1,691 | 1,941 |  |  |
Deferred income taxes | 1,467 | 1,527 |  |  |
Research and development expenditures | 390 | 430 | $ 424 |  |
Advertising costs | 304 | 353 | 345 |  |
Maximum cash investments with single counterparty | 345 |  |  |  |
Capital lease obligations | 3 | 36 | 6 |  |
Accrued capital expenditures financed with extended terms | 15 |  |  |  |
Accrued capital expenditures remaining unpaid | 224 | 243 | 266 |  |
Payments for capital expenditures accrued and unpaid in prior year |  | 243 | 266 | $ 265 |
Restricted net assets | 680 |  |  |  |
Depreciation expense for property, plant and equipment | 857 | 793 | 776 |  |
Total assets | 16,506 | 17,185 |  |  |
Long Term Debt and Finance Leases | 5,432 | 4,753 |  |  |
Total shareholders’ equity | $ 3,259 | 4,545 | $ 5,070 | $ 4,850 |
Lessee, operating lease, option to terminate, term | 1 year |  |  |  |
Lessee, operating lease, term of contract | 12 months |  |  |  |
Minimum |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Payment term | 30 days |  |  |  |
Operating lease, weighted average remaining lease term | 1 year |  |  |  |
Lessee, operating lease, renewal term | 1 year |  |  |  |
Maximum |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Payment term | 90 days |  |  |  |
Operating lease, weighted average remaining lease term | 50 years |  |  |  |
Lessee, operating lease, renewal term | 50 years |  |  |  |
Accounting Standards Update 2016-13 | Restatement Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Retained earnings |  |  |  |  | $ (12)
Accounts receivable |  |  |  |  | (15)
Deferred income taxes |  |  |  |  | $ 3
Accounting Standards Update 2016-09 | Restatement Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Total assets |  | 873 |  |  |
Long Term Debt and Finance Leases |  | 14 |  |  |
Total shareholders’ equity |  | $ (23) |  |  |

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