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Consolidated Statements of Changes in Shareholders' Equity Statement (USD $)
In Millions, unless otherwise specified
Total
Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Loss, Net [Member]
Balance at Dec. 31, 2013 $ 7,787us-gaap_StockholdersEquity $ 2us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
$ 0us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 4,479us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 3,315us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ (9)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 155us-gaap_NetIncomeLoss       155us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
 
Common stock dividends declared (500)us-gaap_DividendsCommonStockCash       (500)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
 
Balance at Mar. 31, 2014 7,442us-gaap_StockholdersEquity 2us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
0us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
4,479us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
2,970us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(9)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Balance at Dec. 31, 2014 7,756us-gaap_StockholdersEquity 2us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
0us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
4,479us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
3,288us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(13)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 134us-gaap_NetIncomeLoss       134us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
 
Common stock dividends declared (450)us-gaap_DividendsCommonStockCash       (450)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
 
Balance at Mar. 31, 2015 $ 7,440us-gaap_StockholdersEquity $ 2us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
$ 0us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 4,479us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 2,972us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ (13)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember