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Equity, Stock Related Disclosures (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 21, 2016 | Jan. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Share Activity Rollforward |  |  |  |  |
Treasury stock, beginning balance |  | (200,462,208) | (159,202,872) |  |
Transactions in connection with stock-based compensation plans: |  |  |  |  |
Treasury stock, ending balance |  |  | (200,462,208) | (159,202,872) |
Equity (Textual) |  |  |  |  |
Preferred stock, shares authorized |  |  | 20,000,000 |  |
Preferred stock, par value per share |  |  | $ 0.01 |  |
Subsequent Event [Member] |  |  |  |  |
Transactions in connection with stock-based compensation plans: |  |  |  |  |
Stock purchases |  | (347,438) |  |  |
Dividend Declared [Member] | Subsequent Event [Member] |  |  |  |  |
Equity (Textual) |  |  |  |  |
Dividends payable, date declared | Jan. 21, 2016 |  |  |  |
Dividends payable, amount per share | $ 0.60 |  |  |  |
Dividends payable, date to be paid | Mar. 03, 2016 |  |  |  |
Dividends payable, date of record | Feb. 09, 2016 |  |  |  |
Stock-Based Compensation Plans Repurchase Program [Member] |  |  |  |  |
Equity (Textual) |  |  |  |  |
Stock repurchases under buyback program |  |  | $ 196,000,000 | $ 128,000,000 | $ 236,000,000
Common Stock Repurchase Program [Member] |  |  |  |  |
Equity (Textual) |  |  |  |  |
Stock repurchases under buyback program |  |  | 2,667,000,000 | $ 1,168,000,000 | $ 692,000,000
$3 Billion Program Approved February 2008 [Member] |  |  |  |  |
Equity (Textual) |  |  |  |  |
Authorized amount under stock purchase program |  |  | 3,000,000,000 |  |
$6 Billion Program Previously Authorized [Member] |  |  |  |  |
Equity (Textual) |  |  |  |  |
Authorized amount under stock purchase program |  |  | 6,000,000,000 |  |
Stock Repurchase Program Approved July 2015 [Member] |  |  |  |  |
Equity (Textual) |  |  |  |  |
Authorized amount under stock purchase program |  |  | 2,500,000,000 |  |
Remaining amount authorized under stock purchase programs |  |  | $ 1,300,000,000 |  |
Common Stock [Member] |  |  |  |  |
Share Activity Rollforward |  |  |  |  |
Common stock, beginning balance |  | 673,000,000 | 673,000,000 | 673,000,000 | 673,000,000
Transactions in connection with stock-based compensation plans: |  |  |  |  |
Stock issuances |  |  | 0 | 0 | 0
Common stock, ending balance |  |  | 673,000,000 | 673,000,000 | 673,000,000
Treasury Stock [Member] |  |  |  |  |
Share Activity Rollforward |  |  |  |  |
Treasury stock, beginning balance |  | (200,000,000) | (159,000,000) | (138,000,000) | (121,000,000)
Transactions in connection with stock-based compensation plans: |  |  |  |  |
Stock issuances |  |  | 4,000,000 | 4,000,000 | 6,000,000
Treasury stock, ending balance |  |  | (200,000,000) | (159,000,000) | (138,000,000)
Treasury Stock [Member] | Stock-Based Compensation Plans Repurchase Program [Member] |  |  |  |  |
Transactions in connection with stock-based compensation plans: |  |  |  |  |
Stock purchases |  |  | (3,000,000) | (2,000,000) | (6,000,000)
Equity (Textual) |  |  |  |  |
Stock repurchases under buyback program |  |  | $ 196,000,000 | $ 128,000,000 | $ 236,000,000
Treasury Stock [Member] | Common Stock Repurchase Program [Member] |  |  |  |  |
Transactions in connection with stock-based compensation plans: |  |  |  |  |
Stock purchases |  |  | (42,000,000) | (23,000,000) | (17,000,000)
Equity (Textual) |  |  |  |  |
Stock repurchases under buyback program |  |  | $ 2,667,000,000 | $ 1,168,000,000 | $ 692,000,000

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