CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDERS' EQUITY - USD ($) $ in Millions	Total	Common stock	Additional Paid In Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning balance at Dec. 31, 2014	$ 10,214	$ 1,264	$ 5,837	$ 3,221	$ (108)
Balance (in shares) at Dec. 31, 2014		505,733,000
Increase (Decrease) in Stockholders' Equity
Net income	984			984
Other comprehensive income (loss)	(2)				(2)
Dividends declared on common stock	(652)			(652)
Issuances of common stock (in shares)		1,803,000
Issuances of common stock	33	$ 5	28
Share-based compensation	24		24
Ending balance at Dec. 31, 2015	10,601	$ 1,269	5,889	3,553	(110)
Balance (in shares) at Dec. 31, 2015		507,536,000
Increase (Decrease) in Stockholders' Equity
Net income	1,123			1,123
Other comprehensive income (loss)	0
Dividends declared on common stock	(694)			(694)
Issuances of common stock (in shares)		486,000
Issuances of common stock	16	$ 1	15
Stock Repurchased During Period, Shares		799,000
Repurchases of common stock	(32)	$ (2)	(30)
Share-based compensation	7		7
Ending balance at Dec. 31, 2016	$ 11,021	$ 1,268	5,881	3,982	(110)
Balance (in shares) at Dec. 31, 2016	507,222,795	507,223,000
Increase (Decrease) in Stockholders' Equity
Net income	$ 1,148			1,148
Other comprehensive income (loss)	7				7
Dividends declared on common stock	(736)			(736)
Issuances of common stock (in shares)		611,000
Issuances of common stock	$ 5	$ 1	4
Stock Repurchased During Period, Shares	100,000
Repurchases of common stock (in shares)		(71,000)
Repurchases of common stock	$ (3)	$ 0	(3)
Share-based compensation	13		16	(3)
Adoption of ASU No. 2018-02	0			22	(22)	[1]
Ending balance at Dec. 31, 2017	$ 11,455	$ 1,269	$ 5,898	$ 4,413	$ (125)
Balance (in shares) at Dec. 31, 2017	507,762,881	507,763,000

[1] (a) In 2017, Xcel Energy implemented ASU No. 2018-02 related to the TCJA, which resulted in reclassification of certain credit balances within net accumulated other comprehensive loss to retained earnings. For further information, see Note 2.