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Equity, Stock Related Disclosures (Details) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 26, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 23, 2018 | Sep. 21, 2016
Share Activity Rollforward |  |  |  |  |  |
Treasury stock, beginning balance (shares) |  | (264,209,742) |  |  |  |
Treasury stock, ending balance (shares) |  | (265,096,171) | (264,209,742) |  |  |
Equity (Textual) |  |  |  |  |  |
Preferred stock authorized (shares) |  | 20,000,000 |  |  |  |
Preferred stock par value per share (in usd per share) |  | $ 0.01 |  |  |  |
Preferred stock outstanding (shares) |  | 0 | 0 |  |  |
Stock repurchases under buyback program |  | $ 130,000,000 | $ 753,000,000 | $ 1,511,000,000 |  |
Remaining amount authorized under stock purchase program |  | 1,400,000,000 |  |  |  |
Subsequent Event [Member] | Dividend Declared [Member] |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |
Dividends payable (in usd per share) | $ 0.98 |  |  |  |  |
Common Stock Repurchase Programs [Member] |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |
Stock repurchases under buyback program |  | $ 83,000,000 | $ 752,000,000 | $ 1,500,000,000 |  |
Stock Repurchase Program Approved September 2016 [Member] |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |
Authorized amount under stock purchase programs |  |  |  |  |  | $ 2,500,000,000
Stock Repurchase Program Approved January 2018 [Member] |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |
Authorized amount under stock purchase programs |  |  |  |  | $ 2,500,000,000 |
Common Stock [Member] |  |  |  |  |  |
Share Activity Rollforward |  |  |  |  |  |
Common stock, beginning balance (shares) |  | 673,000,000 | 673,000,000 | 673,000,000 |  |
Common stock, ending balance (shares) |  | 673,000,000 | 673,000,000 | 673,000,000 |  |
Treasury Stock [Member] |  |  |  |  |  |
Share Activity Rollforward |  |  |  |  |  |
Treasury stock, beginning balance (shares) |  | (264,000,000) | (256,000,000) | (240,000,000) |  |
Transactions in connection with stock-based compensation plans (shares) |  | 1,000,000 | 1,000,000 |  |  |
Open market stock purchases (shares) |  | (2,000,000) | (9,000,000) | (16,000,000) |  |
Treasury stock, ending balance (shares) |  | (265,000,000) | (264,000,000) | (256,000,000) |  |
Equity (Textual) |  |  |  |  |  |
Stock repurchases under buyback program |  | $ 130,000,000 | $ 753,000,000 | $ 1,511,000,000 |  |

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