Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Operating Activities:
Net Income	$ 808		$ 110		$ 773
Adjustments to reconcile net income to net cash flows provided by operating activities:
Non-cash interest and operating expenses	19		18		20
Net amortization of premium (discount) on investments	(8)		8		23
Provision (benefit) for deferred income taxes	177		(35)		383
Net realized investment losses (gains)	(52)		(1)		18
Net unrealized losses (gains) on credit derivatives	(107)	[1]	477	[1]	(554)	[1]
Fair value loss (gains) on committed capital securities	(10)		18		(35)
Change in deferred acquisition costs	(8)		18		18
Change in premiums receivable, net of commissions payable	86		48		138
Change in ceded unearned premium reserve	109		141		102
Change in unearned premium reserve	(612)		(749)		(998)
Change in loss and loss adjustment expense reserve, net	136		(258)		636
Change in current income tax	30		129		(182)
Change in financial guaranty variable interest entities' assets and liabilities, net	(295)		(7)		352
(Purchases) sales of trading securities, net	(16)		(59)		(6)
Other	(13)		(23)		(12)
Net cash flows provided by (used in) operating activities	244		(165)		676
Fixed-maturity securities:
Purchases	(1,886)		(1,649)		(2,308)
Sales	1,029		912		1,107
Maturities	883		1,105		663
Net sales (purchases) of short-term investments	(87)		29		320
Net proceeds from paydowns on financial guaranty variable interest entities’ assets	663		545		760
Acquisition of MAC, net of cash acquired	0		(91)		0
Other	79		92		19
Net cash flows provided by (used in) investing activities	681		943		561
Financing activities
Proceeds from issuances of common stock	0		173		0
Dividends paid	(75)		(69)		(33)
Repurchases of common stock	(264)		(24)		(23)
Share activity under option and incentive plans	(1)		(3)		(1)
Net paydowns of financial guaranty variable interest entities’ liabilities	(511)		(724)		(1,053)
Repayment of long-term debt	(27)		(209)		(22)
Net cash flows provided by (used in) financing activities	(878)		(856)		(1,132)
Effect of exchange rate changes	(1)		1		2
Increase (decrease) in cash	46		(77)		107
Cash at beginning of period	138		215		108
Cash at end of period	184		138		215
Cash paid (received) during the period for:
Income taxes	110		(24)		34
Interest	$ 76		$ 85		$ 92

[1] Except for net estimated credit impairments (i.e., net expected loss to be paid as discussed in Note 6), the unrealized gains and losses on credit derivatives are expected to reduce to zero as the exposure approaches its maturity date. With considerable volatility continuing in the market, unrealized gains (losses) on credit derivatives may fluctuate significantly in future periods.