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Consolidated Statement of Shareholders' Equity (USD $)
In Millions, except Share data, unless otherwise specified
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss) [Member]
Deferred Equity Compensation
Beginning balance at Dec. 31, 2011 $ 4,652us-gaap_StockholdersEquity $ 2us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 2,570us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 1,708us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 368us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
$ 4us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_DeferredCompensationShareBasedPaymentsMember
Beginning balance (in shares) at Dec. 31, 2011   182,235,798us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Increase (Decrease) in Shareholders' Equity            
Net Income 110us-gaap_NetIncomeLoss     110us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
   
Dividends (2012 $0.36, 2013 $0.40, 2014 $0.44 per share) (69)us-gaap_DividendsCommonStockCash     (69)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
   
Common stock issuance, net (in shares)   13,428,770us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Common stock issuance, net 173us-gaap_StockIssuedDuringPeriodValueNewIssues   173us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Common stock repurchases (in shares)   (2,066,759)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Common stock repurchases (24)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue   (24)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Share-based compensation and other (in shares)   405,488ago_StockIssuedDuringPeriodSharesShareBasedCompensationAndOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Share-based compensation and other 5ago_StockIssuedDuringPeriodValueSharebasedCompensationandOther   5ago_StockIssuedDuringPeriodValueSharebasedCompensationandOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Other comprehensive income (loss) 147us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent       147us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
 
Ending balance at Dec. 31, 2012 4,994us-gaap_StockholdersEquity 2us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
2,724us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
1,749us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
515us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
4us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_DeferredCompensationShareBasedPaymentsMember
Ending balance (in shares) at Dec. 31, 2012   194,003,297us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Increase (Decrease) in Shareholders' Equity            
Net Income 808us-gaap_NetIncomeLoss     808us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
   
Dividends (2012 $0.36, 2013 $0.40, 2014 $0.44 per share) (75)us-gaap_DividendsCommonStockCash     (75)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
   
Common stock repurchases (in shares)   (12,512,759)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Common stock repurchases (264)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue   (264)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Share-based compensation and other (in shares)   687,328ago_StockIssuedDuringPeriodSharesShareBasedCompensationAndOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Share-based compensation and other 7ago_StockIssuedDuringPeriodValueSharebasedCompensationandOther   6ago_StockIssuedDuringPeriodValueSharebasedCompensationandOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
    1ago_StockIssuedDuringPeriodValueSharebasedCompensationandOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_DeferredCompensationShareBasedPaymentsMember
Other comprehensive income (loss) (355)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent       (355)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
 
Ending balance at Dec. 31, 2013 5,115us-gaap_StockholdersEquity 2us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
2,466us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
2,482us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
160us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
5us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_DeferredCompensationShareBasedPaymentsMember
Ending balance (in shares) at Dec. 31, 2013   182,177,866us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Increase (Decrease) in Shareholders' Equity            
Net Income 1,088us-gaap_NetIncomeLoss     1,088us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
   
Dividends (2012 $0.36, 2013 $0.40, 2014 $0.44 per share) (76)us-gaap_DividendsCommonStockCash     (76)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
   
Common stock repurchases (in shares)   (24,413,781)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Common stock repurchases (590)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue   (590)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Share-based compensation and other (in shares)   542,576ago_StockIssuedDuringPeriodSharesShareBasedCompensationAndOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Share-based compensation and other 11ago_StockIssuedDuringPeriodValueSharebasedCompensationandOther   11ago_StockIssuedDuringPeriodValueSharebasedCompensationandOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Other comprehensive income (loss) 210us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent       210us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
 
Ending balance at Dec. 31, 2014 $ 5,758us-gaap_StockholdersEquity $ 2us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 1,887us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 3,494us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 370us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
$ 5us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_DeferredCompensationShareBasedPaymentsMember
Ending balance (in shares) at Dec. 31, 2014   158,306,661us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember