Other Investments (Tables)

6 Months Ended

Jun. 30, 2011

Other Investments

Amortized cost and fair value of the trust investments:

		Amortized Cost				Fair Value
(in millions)	Longest Maturity Dates	June 30, 2011		December 31, 2010		June 30, 2011		December 31, 2010
Stocks	—	$	862	$	895	$	2,062	$	2,029
Municipal bonds	2050		699		706		812		790
U.S. government and agency securities	2041		396		270		427		288
Corporate bonds	2054		255		288		310		346
Short-term investments and receivables/payables	One-year		44		26		46		27
Total		$	2,256	$	2,185	$	3,657	$	3,480

Summary of changes in the fair value of trust

	Three months ended June 30,						Six months ended June 30,
(in millions)	2011			2010			2011			2010
Balance at beginning of period	$	3,619		$	3,248		$	3,480		$	3,140
Realized gains – net		12			13			35			34
Unrealized gains (losses) – net		4			(205	)		106			(143	)
Other-than-temporary impairments		(4	)		(7	)		(13	)		(11	)
Interest, dividends, contributions and other		26			34			49			63
Balance at end of period	$	3,657		$	3,083		$	3,657		$	3,083