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Stock Transactions And Stock-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions |  |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 02, 2021 | Dec. 31, 2020 | May 31, 2020 | Mar. 31, 2019 | Apr. 02, 2021 | Jul. 16, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Authorized shares to be repurchased |  |  |  |  |  | 20,000
Remaining number of shares authorized to be repurchased | 20,000 |  |  |  | 20,000 |
Common shares reserved for issuance under the 2007 Omnibus Incentive Plan, shares | 50,000 |  |  |  | 50,000 |
RSU/PSUs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total unrecognized compensation cost | $ 261 |  |  |  | $ 261 |
Weighted average period for cost to be recognized |  |  |  |  | 3 years |
Stock options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total unrecognized compensation cost | $ 255 |  |  |  | $ 255 |
Weighted average period for cost to be recognized | 3 years |  |  |  |  |
Common stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Issuance of stock |  |  | 10,900 |  |  |
Common stock issued, price per share |  |  | $ 163.00 |  |  |
Common stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock, proceeds from issuance |  |  | $ 1,730 |  |  |
Payments of stock issuance costs |  |  | $ 54 |  |  |
Threshold consecutive trading days |  |  | 20 | 20 |  |
Preferred stock | Preferred stock series B |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Payments of stock issuance costs |  |  | $ 49 |  |  |
Preferred stock, shares issued | 1,720 | 1,720 | 1,720 |  | 1,720 |
Preferred stock, dividend rate, percent | 5.00% | 5.00% | 5.00% |  |  |
Preferred stock, liquidation preference per share |  |  | $ 1,000 |  |  |
Preferred stock, proceeds from the issuance |  |  | $ 1,670 |  |  |
Preferred stock | Preferred stock series A |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Preferred stock, shares issued | 1,650 | 1,650 |  | 1,650 | 1,650 |
Preferred stock, dividend rate, percent | 4.75% | 4.75% |  | 4.75% |  |
Preferred stock, liquidation preference per share |  |  |  | $ 1,000 |  |

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