Consolidated Statements Of Stockholders' Equity (USD $) In Millions	Common Stock	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	23
Retirement of common stock/cancellation of shares	(492)
Net income (loss)		1,313		1,313
Dividends declared: Common (2014 - $0.68; 2013 - $0.52; 2012 - $0.36)		(100)
Other comprehensive income (loss), net of tax			1,128	1,128
Balance as of end-of-year at Dec. 31, 2012	7,121	4,044	3,808	14,973
Stock compensation/issued for benefit plans	69
Retirement of common stock/cancellation of shares	(314)	(136)
Net income (loss)		1,244		1,244
Dividends declared: Common (2014 - $0.68; 2013 - $0.52; 2012 - $0.36)		(139)
Other comprehensive income (loss), net of tax			(2,245)	(2,245)
Balance as of end-of-year at Dec. 31, 2013	6,876	5,013	1,563	13,452
Stock compensation/issued for benefit plans	69
Retirement of common stock/cancellation of shares	(323)	(327)
Net income (loss)		1,515		1,515
Dividends declared: Common (2014 - $0.68; 2013 - $0.52; 2012 - $0.36)		(179)
Other comprehensive income (loss), net of tax			1,533	1,533
Balance as of end-of-year at Dec. 31, 2014	$ 6,622	$ 6,022	$ 3,096	$ 15,740