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	18
Retirement of common stock/cancellation of shares	(202)	(48)
Net income (loss)		556		556
Dividends declared: Common (2014 - $0.32; 2013 - $0.24)		(65)
Other comprehensive income (loss), net of tax			(1,915)	(1,915)
Balance as of end-of-period at Jun. 30, 2013	6,937	4,487	1,893	13,317
Balance as of beginning-of-year at Dec. 31, 2013	6,876	5,013	1,563	13,452
Stock compensation/issued for benefit plans	20
Retirement of common stock/cancellation of shares	(157)	(143)
Net income (loss)		727		727
Dividends declared: Common (2014 - $0.32; 2013 - $0.24)		(84)
Other comprehensive income (loss), net of tax			1,636	1,636
Balance as of end-of-period at Jun. 30, 2014	$ 6,739	$ 5,513	$ 3,199	$ 15,451