Consolidated Statement of Shareholder's Equity (USD $) In Millions	Total	Capital stock	Additional paid-in capital	Accumulated other comprehensive income	Retained earnings
BALANCE AT at Mar. 31, 2011	$ 6,856	$ 915	$ 1	$ 100	$ 5,840
Net income	1,348	0	0	0	1,348
Other comprehensive income, net of tax	9	0	0	9	0
Stock-based compensation	1	0	1	0	0
Dividends	(741)	0	0	0	(741)
BALANCE AT at Dec. 31, 2011	7,473	915	2	109	6,447
BALANCE AT at Mar. 31, 2012	7,662	915	2	160	6,585
Net income	1,086	0	0	0	1,086
Other comprehensive income, net of tax	26	0	0	26	0
Stock-based compensation	0
Dividends	(744)	0	0	0	(744)
BALANCE AT at Dec. 31, 2012	$ 8,030	$ 915	$ 2	$ 186	$ 6,927