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Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 5,076 | [1] | $ 5,139 | [1] | $ 5,384 | [1] | $ 4,826 | [1] | $ 4,977 | [1] | $ 5,318 | [1] | $ 5,111 | [1] | $ 4,414 | [1] | $ 20,425 | $ 19,820 | $ 18,605
Operating income | 846 |  | 695 |  | 1,276 |  | 944 |  | 1,026 |  | 1,225 |  | 1,085 |  | 780 |  | 3,760 | 4,116 | 2,225
Income before income taxes | 809 |  | 618 |  | 1,304 |  | 816 |  | 847 |  | 933 |  | 977 |  | 723 |  | 3,547 | 3,479 | 1,816
Net income | $ 522 | [2] | $ 388 | [2] | $ 820 | [2] | $ 513 | [2] | $ 536 |  | $ 584 |  | $ 608 |  | $ 453 |  | $ 2,244 | $ 2,181 | $ 1,136
Basic (in dollars per share) | $ 0.85 | [1],[2] | $ 0.63 | [1],[2] | $ 1.30 | [1],[2] | $ 0.80 | [1],[2] | $ 0.83 | [1] | $ 0.89 | [1] | $ 0.91 | [1] | $ 0.67 | [1] | $ 3.58 | $ 3.30 | $ 1.65
Diluted (in dollars per share) | $ 0.84 | [1],[2] | $ 0.62 | [1],[2] | $ 1.28 | [1],[2] | $ 0.79 | [1],[2] | $ 0.82 | [1] | $ 0.88 | [1] | $ 0.90 | [1] | $ 0.66 | [1] | $ 3.55 | $ 3.27 | $ 1.64
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results |  |  |  |  | $ 137 |  | $ 115 |  | $ 124 |  | $ 303 |  |  |  |  |  | $ 544 | $ 427 |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Basic Earnings Per Share |  |  |  |  | $ 0.12 |  | $ 0.10 |  | $ 0.10 |  | $ 0.24 |  |  |  |  |  | $ 0.47 | $ 0.34 |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Diluted Earnings Per Share |  |  |  |  | $ 0.11 |  | $ 0.09 |  | $ 0.10 |  | $ 0.24 |  |  |  |  |  | $ 0.46 | $ 0.34 |
Proceeds and Excess Tax Benefit from Share-based Compensation |  |  |  |  |  |  | $ 2 |  |  |  |  |  |  |  |  |  | $ 7 |  |
[1] | Includes the impact of the Agreement with Chase and the resulting required change in accounting methodology. The impact of this change during third quarter and fourth quarter 2015 resulted in increases to Operating revenue of approximately $303 million and $124 million, respectively, and increased Basic and Diluted net income per share by approximately $.24 in third quarter 2015 and by approximately $.10 in fourth quarter 2015. The impact of this change resulted in an increase to Operating revenue during first quarter 2016 of approximately $115 million and increased Basic and Diluted net income per share by approximately $.10 and $.09, respectively. The impact of this change resulted in an increase to Operating revenue during second quarter 2016 of approximately $137 million, and increased Basic and Diluted net income per share by approximately $.12 and $.11, respectively. See Note 1 for further detail.
[2] | During second quarter 2016, the Company early adopted ASU No. 2016-09, Improvements to Employee Share-Based Payment Accounting, with an effective date as of January 1, 2016. The prospective method of adoption of this standard resulted in the recognition of $2 million of excess tax benefits to the Company's income tax provision for the six months ended June 30, 2016, but which were related to first quarter 2016. For this presentation and in future periods in which first quarter 2016 results are reported, these amounts are reflected in the appropriate period. The adoption had no impact to net income per share amounts. See Note 2 for further information.

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