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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, 2019
 [1]
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
NUMERATOR:                      
Net income $ 514 $ 659 $ 741 $ 387 $ 654 $ 615 $ 733 $ 463 $ 2,300 $ 2,465 $ 3,357
DENOMINATOR:                      
Weighted-average shares outstanding, basic                 538 573 601
Dilutive effect of restricted stock units                 1 1 2
Adjusted weighted-average shares outstanding, diluted                 539 574 603
NET INCOME PER SHARE:                      
Basic (in dollars per share) $ 0.98 $ 1.24 $ 1.37 $ 0.70 $ 1.17 $ 1.08 $ 1.27 $ 0.79 $ 4.28 $ 4.30 $ 5.58
Diluted (in dollars per share) $ 0.98 $ 1.23 $ 1.37 $ 0.70 $ 1.17 $ 1.08 $ 1.27 $ 0.79 $ 4.27 $ 4.29 $ 5.57
[1] In addition to the ongoing impact of the Boeing 737 MAX aircraft ("MAX") grounding that impacted all four quarters of 2019, fourth quarter 2019 also included the impact of the pre-tax $124 million discretionary, special profitsharing award accrual authorized by the Company's Board of Directors during fourth quarter 2019 for compensation received from Boeing related to the Company's estimated 2019 financial damages related to the grounding of the Boeing 737 MAX. See Note 16 to the Consolidated Financial Statements for further information on the MAX groundings. The impact of this accrual resulted in a decrease to Net income of approximately $97 million and reduced Basic and Diluted net income per share by approximately $.18 for the fourth quarter 2019.