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QUARTERLY FINANCIAL DATA | 12 Months Ended
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Dec. 31, 2016
Quarterly Financial Data [Abstract] |
QUARTERLY FINANCIAL DATA | QUARTERLY FINANCIAL DATA (unaudited)
|  | Three months ended
(in millions except per share amounts) |  | March 31 |  | June 30 |  | Sept. 30 |  | Dec. 31
2016 |  |  |  |  |  |  |  |
Operating revenues (a) |  | $ | 4,826 |  |  | $ | 5,384 |  |  | $ | 5,139 |  |  | $ | 5,076 |
Operating income |  | 944 |  |  | 1,276 |  |  | 695 |  |  | 846 |
Income before income taxes |  | 816 |  |  | 1,304 |  |  | 618 |  |  | 809 |
Net income (b) |  | 513 |  |  | 820 |  |  | 388 |  |  | 522 |
Net income per share, basic (a)(b) |  | 0.80 |  |  | 1.30 |  |  | 0.63 |  |  | 0.85 |
Net income per share, diluted (a)(b) |  | 0.79 |  |  | 1.28 |  |  | 0.62 |  |  | 0.84 |
|  | March 31 |  | June 30 |  | Sept. 30 |  | Dec. 31
2015 |  |  |  |  |  |  |  |
Operating revenues (a) |  | $ | 4,414 |  |  | $ | 5,111 |  |  | $ | 5,318 |  |  | $ | 4,977 |
Operating income |  | 780 |  |  | 1,085 |  |  | 1,225 |  |  | 1,026 |
Income before income taxes |  | 723 |  |  | 977 |  |  | 933 |  |  | 847 |
Net income |  | 453 |  |  | 608 |  |  | 584 |  |  | 536 |
Net income per share, basic (a) |  | 0.67 |  |  | 0.91 |  |  | 0.89 |  |  | 0.83 |
Net income per share, diluted (a) |  | 0.66 |  |  | 0.90 |  |  | 0.88 |  |  | 0.82 |
(a) 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. (b) 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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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1570-108306 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e765-108305 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e725-108305 + Details
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