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Basis of Presentation and Significant Accounting Policies and Practices (Tables) | 12 Months Ended
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Dec. 31, 2016
Organization Consolidation And Presentation Of Financial Statements [Abstract] |
Schedule of Earnings per Share, Basic and Diluted | Computation and reconciliation of earnings per common share are as follows (shares in millions):
| For Years Ended December 31, |
| 2016 |  |  | 2015 |  |  | 2014 |
| Net |  |  |  |  |  |  |  |  |  | Net |  |  |  |  |  |  |  |  |  | Net |  |  |  |  |  |  |  |
| Income |  | Shares | EPS |  |  | Income |  | Shares | EPS |  |  | Income |  | Shares | EPS |
Basic EPS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ |  | 3,595 |  |  |  |  |  |  |  |  |  |  |  | $ |  | 2,986 |  |  |  |  |  |  |  |  |  |  |  | $ |  | 2,821 |  |  |  |  |  |  |  |  |  |
Income allocated to RSUs |  |  | (45 | ) |  |  |  |  |  |  |  |  |  |  |  |  | (43 | ) |  |  |  |  |  |  |  |  |  |  |  |  | (44 | ) |  |  |  |  |  |  |  |  |
Income allocated to common stock for basic EPS calculation | $ |  | 3,550 |  |  |  | 1,003 |  |  | $ |  | 3.54 |  |  | $ |  | 2,943 |  |  |  | 1,030 |  |  | $ |  | 2.86 |  |  | $ |  | 2,777 |  |  |  | 1,065 |  |  | $ |  | 2.61 |
Adjustment for dilutive shares: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock compensation plans |  |  |  |  |  |  | 18 |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 |  |  |  |  |  |
Diluted EPS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ |  | 3,595 |  |  |  |  |  |  |  |  |  |  |  | $ |  | 2,986 |  |  |  |  |  |  |  |  |  |  |  | $ |  | 2,821 |  |  |  |  |  |  |  |  |  |
Income allocated to RSUs |  |  | (44 | ) |  |  |  |  |  |  |  |  |  |  |  |  | (42 | ) |  |  |  |  |  |  |  |  |  |  |  |  | (43 | ) |  |  |  |  |  |  |  |  |
Income allocated to common stock for diluted EPS calculation | $ |  | 3,551 |  |  |  | 1,021 |  |  | $ |  | 3.48 |  |  | $ |  | 2,944 |  |  |  | 1,043 |  |  | $ |  | 2.82 |  |  | $ |  | 2,778 |  |  |  | 1,080 |  |  | $ |  | 2.57 |
Effects of Adoption of New Standard | The effects of our adoption of the new standard on our unaudited quarterly results for 2016 are as follows:
| Quarter |
| 1st |  |  | 2nd |  |  | 3rd |
| Reported |  |  | Recast |  |  | Reported |  |  | Recast |  |  | Reported |  |  | Recast |
Income statement data: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for income taxes | $ |  | 282 |  |  | $ |  | 239 |  |  | $ |  | 323 |  |  | $ |  | 283 |  |  | $ |  | 413 |  |  | $ |  | 363 |
Net income |  |  | 668 |  |  |  |  | 711 |  |  |  |  | 779 |  |  |  |  | 819 |  |  |  |  | 968 |  |  |  |  | 1,018 |
Average diluted shares outstanding, in millions |  |  | 1,018 |  |  |  |  | 1,022 |  |  |  |  | 1,016 |  |  |  |  | 1,020 |  |  |  |  | 1,017 |  |  |  |  | 1,023 |
Basic EPS | $ |  | 0.65 |  |  | $ |  | 0.70 |  |  | $ |  | 0.77 |  |  | $ |  | 0.81 |  |  | $ |  | 0.95 |  |  | $ |  | 1.00 |
Diluted EPS | $ |  | 0.65 |  |  | $ |  | 0.69 |  |  | $ |  | 0.76 |  |  | $ |  | 0.79 |  |  | $ |  | 0.94 |  |  | $ |  | 0.98 |
Cash flow data: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities | $ |  | 547 |  |  | $ |  | 653 |  |  | $ |  | 1,069 |  |  | $ |  | 1,109 |  |  | $ |  | 1,413 |  |  | $ |  | 1,465 |
Cash flows from financing activities |  |  | (839 | ) |  |  |  | (945 | ) |  |  |  | (1,180 | ) |  |  |  | (1,220 | ) |  |  |  | (676 | ) |  |  |  | (728 | )
Certain annual cash flow information has also been adjusted to reflect select aspects of the new standard that are applied retrospectively. The impact to our previously reported annual results is as follows:
| For Years Ended December 31, |
| 2015 |  |  | 2014 |
| Reported |  |  | Recast |  |  | Reported |  |  | Recast |
Cash flows from operating activities | $ |  | 4,268 |  |  | $ |  | 4,397 |  |  | $ |  | 3,892 |  |  | $ |  | 4,054 |
Cash flows from financing activities |  |  | (4,165 | ) |  |  |  | (4,294 | ) |  |  |  | (3,943 | ) |  |  |  | (4,105 | )

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