Consolidated Statements Of Stockholders' Equity (USD $) In Millions	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balance as of beginning-of-year at Dec. 31, 2011	$ 7,590	$ 2,831	$ 2,680
Stock compensation/issued for benefit plans	24
Retirement of common stock/cancellation of shares	(400)
Net income (loss)		992		992
Dividends declared: Common (2013 - $0.360; 2012 - $0.240)		(67)
Other comprehensive income (loss), net of tax			1,471	1,471
Balance as of end-of-period at Sep. 30, 2012	7,214	3,756	4,151	15,121
Balance as of beginning-of-year at Dec. 31, 2012	7,121	4,044	3,808	14,973
Stock compensation/issued for benefit plans	27
Retirement of common stock/cancellation of shares	(262)	(88)
Net income (loss)		893		893
Dividends declared: Common (2013 - $0.360; 2012 - $0.240)		(96)
Other comprehensive income (loss), net of tax			(2,058)	(2,058)
Balance as of end-of-period at Sep. 30, 2013	$ 6,886	$ 4,753	$ 1,750	$ 13,389