Debt (tables)

12 Months Ended

Dec. 31, 2012

Debt disclosure

Debt outstanding [Table Text Block]

(at December 31, in millions)	2012			2011
Short-term:
Commercial paper	$	100		$	100
5.00% Senior notes due March 15, 2013		500			—
5.375% Senior notes due June 15, 2012		—			250
Total short-term debt		600			350
Long-term:
5.00% Senior notes due March 15, 2013		—			500
5.50% Senior notes due December 1, 2015		400			400
6.25% Senior notes due June 20, 2016		400			400
5.75% Senior notes due December 15, 2017		450			450
5.80% Senior notes due May 15, 2018		500			500
5.90% Senior notes due June 2, 2019		500			500
3.90% Senior notes due November 1, 2020		500			500
7.75% Senior notes due April 15, 2026		200			200
7.625% Junior subordinated debentures due December 15, 2027		125			125
6.375% Senior notes due March 15, 2033		500			500
6.75% Senior notes due June 20, 2036		400			400
6.25% Senior notes due June 15, 2037		800			800
5.35% Senior notes due November 1, 2040		750			750
8.50% Junior subordinated debentures due December 15, 2045		56			56
8.312% Junior subordinated debentures due July 1, 2046		73			73
6.25% Fixed-to-floating rate junior subordinated debentures due March 15, 2067		107			115
Total long-term debt		5,761			6,269
Total debt principal		6,361			6,619
Unamortized fair value adjustment		52			53
Unamortized debt issuance costs		(63	)		(67	)
Total debt	$	6,350		$	6,605

Merger-related unamortized fair value adjustments and the related effective interest rate [Table Text Block]

						Unamortized Fair Value Purchase Adjustment at December 31,
										Effective Interest Rate to Maturity
(in millions)	Issue Rate			Maturity Date		2012		2011
Subordinated debentures		7.625	%		Dec. 2027	$	17	$	18		6.147	%
		8.500	%		Dec. 2045		16		16		6.362	%
		8.312	%		Jul. 2046		19		19		6.362	%
Total						$	52	$	53