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Accounts Receivable (Activity in the Allowance for Doubtful Accounts) (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Allowance for Doubtful Accounts Receivable [Roll Forward] | |||
| Balance beginning of year | $ 83us-gaap_AllowanceForDoubtfulAccountsReceivable | $ 74us-gaap_AllowanceForDoubtfulAccountsReceivable | $ 79us-gaap_AllowanceForDoubtfulAccountsReceivable |
| Additions- charged to expense | 92us-gaap_ProvisionForDoubtfulAccounts | 81us-gaap_ProvisionForDoubtfulAccounts | 75us-gaap_ProvisionForDoubtfulAccounts |
| Deductions- write-offs | (84)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs | (72)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs | (80)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs |
| Balance end of year | $ 91us-gaap_AllowanceForDoubtfulAccountsReceivable | $ 83us-gaap_AllowanceForDoubtfulAccountsReceivable | $ 74us-gaap_AllowanceForDoubtfulAccountsReceivable |
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- Definition
For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Amount of direct write-downs of accounts receivable charged against the allowance. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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