Consolidated Statement of Shareholder's Equity (USD $) In Millions	Total	Capital stock	Additional paid-in capital	Accumulated other comprehensive income	Retained earnings
Balance at Mar. 31, 2013	$ 7,557	$ 915	$ 2	$ 211	$ 6,429
Net income	528				528
Other comprehensive income (loss), net of tax	(18)			(18)
Dividends	(665)				(665)
Balance at Dec. 31, 2013	7,402	915	2	193	6,292
Balance at Mar. 31, 2014	7,738	915	2	200	6,621
Net income	962				962
Other comprehensive income (loss), net of tax	6			6
Dividends	(435)				(435)
Balance at Dec. 31, 2014	$ 8,271	$ 915	$ 2	$ 206	$ 7,148