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Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
 [1]
Jun. 30, 2016
 [1]
Mar. 31, 2016
 [1]
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
NUMERATOR:                      
Net income $ 522 [1] $ 388 $ 820 $ 513 $ 536 $ 584 $ 608 $ 453 $ 2,244 $ 2,181 $ 1,136
Incremental income effect of interest on 5.25% convertible notes (a) [2]                 2 4 4
Net income after assumed conversion                 $ 2,246 $ 2,185 $ 1,140
DENOMINATOR:                      
Weighted-average shares outstanding, basic                 627 661 687
Dilutive effect of Employee stock options and restricted stock units                 1 2 3
Dilutive effect of 5.25% convertible notes (a) [2]                 5 6 6
Adjusted weighted-average shares outstanding, diluted                 633 669 696
NET INCOME PER SHARE:                      
Basic (in dollars per share) $ 0.85 [1],[3] $ 0.63 [3] $ 1.30 [3] $ 0.80 [3] $ 0.83 [3] $ 0.89 [3] $ 0.91 [3] $ 0.67 [3] $ 3.58 $ 3.30 $ 1.65
Diluted (in dollars per share) $ 0.84 [1],[3] $ 0.62 [3] $ 1.28 [3] $ 0.79 [3] $ 0.82 [3] $ 0.88 [3] $ 0.90 [3] $ 0.66 [3] $ 3.55 $ 3.27 $ 1.64
Convertible Debt | 5.25% Convertible Senior Notes due 2016                      
Potentially dilutive amounts excluded from calculations:                      
Debt Instrument, Interest Rate, Stated Percentage 5.25%       5.25%       5.25% 5.25% 5.25%
[1] 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.
[2] See Note 6 for further information related to the convertible notes.
[3] 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.