Debt (Term Convertible Trust Securities) (Details) $ / shares in Units, security in Thousands, shares in Millions, $ in Millions	24 Months Ended
	Dec. 31, 2000 USD ($)	Dec. 31, 1999 USD ($) security quarter $ / shares shares
Debt Disclosure [Abstract]
Term convertible preferred securities issued by special purpose business trust | security		10,350
Current redemption value of term convertible preferred securities issued by special purpose business trust		$ 50
Term convertible preferred securities issued by special purpose business trust par per share		$ 0.844
Term convertible preferred securities issued by special purpose business trust total proceeds | $	$ 517
Junior subordinated convertible debentures purchased with proceeds from issuance of term convertible preferred securities | $		$ 517
Term convertible preferred securities dividend rate		6.75%
Term convertible preferred securities common stock conversion ratio	142.16%
Term convertible preferred securities common stock conversion price per share		$ 35.17
Maximum shares parent common stock issuance upon conversion | shares		14.7
Term convertible preferred securities number of quarters dividends may be deferred | quarter		20