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, 2012	$ 7,121	$ 4,044	$ 3,808
Stock compensation/issued for benefit plans	27
Retirement of common stock/cancellation of shares	(262)	(88)
Net income (loss)		893		893
Dividends declared: Common (2014 - $0.48; 2013 - $0.36)		(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
Balance as of beginning-of-year at Dec. 31, 2013	6,876	5,013	1,563	13,452
Stock compensation/issued for benefit plans	51
Retirement of common stock/cancellation of shares	(231)	(219)
Net income (loss)		1,166		1,166
Dividends declared: Common (2014 - $0.48; 2013 - $0.36)		(126)
Other comprehensive income (loss), net of tax			1,359	1,359
Balance as of end-of-period at Sep. 30, 2014	$ 6,696	$ 5,834	$ 2,922	$ 15,452