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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Basic EPS Calculation
Earnings available to common stockholders - Basic	$ 14,824	$ 9,195	$ (497)
Weighted-average number of common shares outstanding (in shares)	1,897	1,882	1,872
Add: Deferred awards held as stock units (in shares)	1	1	1
Total weighted-average number of common shares outstanding (in shares)	1,898	1,883	1,873
Earnings per share of common stock - Basic (in dollars per share)	$ 7.81	$ 4.88	$ (0.27)
Diluted EPS Calculation
Earnings available to common stockholders - Diluted	$ 14,824	$ 9,195	$ (497)
Weighted-average number of common shares outstanding (in shares)	1,897	1,882	1,872
Add: Deferred awards held as stock units (in shares)	1	1	1
Add: Dilutive effect of employee stock-based awards (in shares)	16	15	0
Total weighted-average number of common shares outstanding (in shares)	1,914	1,898	1,873
Earnings per share of common stock - Diluted (in dollars per share)	$ 7.74	$ 4.85	$ (0.27)
Employee-based Awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
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