Fair Value Measurement of Assets and Liabilities (Details) (USD $) | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2013 | Dec. 31, 2012 |
In Millions, unless otherwise specified |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Cash and cash equivalents | $3,834 | $4,494 | $6,855 | $6,817 |
Fair Value Disclosure, additional details | ' | ' | ' | ' |
Funds receivable and customer accounts | 10,037 | 9,260 | ' | ' |
Long-Term Investment [Member] | ' | ' | ' | ' |
Fair Value Disclosure, additional details | ' | ' | ' | ' |
Cost and equity method investments included in long-term investments | 364 | 269 | ' | ' |
Other Current Assets | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Derivative Asset Reported in Other Current Assets | ' | 44 | ' | ' |
Other Current Liabilities | ' | ' | ' | ' |
Fair Value Disclosure, additional details | ' | ' | ' | ' |
Derivative Liabilities Reported in Other Current Liabilities | ' | 151 | ' | ' |
Foreign Government Debt Securities [Member] | Short-term Investments [Member] | ' | ' | ' | ' |
Fair Value Disclosure, additional details | ' | ' | ' | ' |
Funds receivable and customer accounts | 3,603 | 3,563 | ' | ' |
Estimate of Fair Value, Fair Value Disclosure | Fair Value, Measurements, Recurring [Member] | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Cash and cash equivalents | ' | 4,494 | ' | ' |
Financial assets | 16,862 | 17,328 | ' | ' |
Estimate of Fair Value, Fair Value Disclosure | Fair Value, Measurements, Recurring [Member] | Short-term Investments [Member] | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Investments | 3,535 | 4,531 | ' | ' |
Estimate of Fair Value, Fair Value Disclosure | Fair Value, Measurements, Recurring [Member] | Long-Term Investment [Member] | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Investments | 5,853 | 4,696 | ' | ' |
Estimate of Fair Value, Fair Value Disclosure | Fair Value, Measurements, Recurring [Member] | Other Current Assets | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Derivative assets | 37 | 44 | ' | ' |
Estimate of Fair Value, Fair Value Disclosure | Fair Value, Measurements, Recurring [Member] | Other Current Liabilities | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Derivatives liabilities | 114 | 151 | ' | ' |
Estimate of Fair Value, Fair Value Disclosure | Fair Value, Measurements, Recurring [Member] | Restricted Cash [Member] | Short-term Investments [Member] | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Investments | 32 | 17 | ' | ' |
Estimate of Fair Value, Fair Value Disclosure | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Short-term Investments [Member] | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Investments | 2,673 | 3,529 | ' | ' |
Estimate of Fair Value, Fair Value Disclosure | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Long-Term Investment [Member] | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Investments | 5,615 | 4,445 | ' | ' |
Estimate of Fair Value, Fair Value Disclosure | Fair Value, Measurements, Recurring [Member] | Foreign Government Debt Securities [Member] | Short-term Investments [Member] | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Investments | 4 | 43 | ' | ' |
Estimate of Fair Value, Fair Value Disclosure | Fair Value, Measurements, Recurring [Member] | Foreign Government Debt Securities [Member] | Long-Term Investment [Member] | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Investments | 238 | 251 | ' | ' |
Estimate of Fair Value, Fair Value Disclosure | Fair Value, Measurements, Recurring [Member] | Time Deposits and Other [Member] | Short-term Investments [Member] | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Investments | 50 | ' | ' | ' |
Estimate of Fair Value, Fair Value Disclosure | Fair Value, Measurements, Recurring [Member] | Bank Time Deposits [Member] | Short-term Investments [Member] | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Investments | ' | 49 | ' | ' |
Estimate of Fair Value, Fair Value Disclosure | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Short-term Investments [Member] | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Investments | 776 | 893 | ' | ' |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring [Member] | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Cash and cash equivalents | 3,526 | 4,159 | ' | ' |
Financial assets | 4,334 | 5,069 | ' | ' |
Fair Value Disclosure, additional details | ' | ' | ' | ' |
Funds receivable and customer accounts | 0 | 0 | ' | ' |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring [Member] | Short-term Investments [Member] | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Investments | 808 | 910 | ' | ' |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring [Member] | Long-Term Investment [Member] | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Investments | 0 | 0 | ' | ' |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring [Member] | Other Current Assets | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Derivative assets | 0 | 0 | ' | ' |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring [Member] | Other Current Liabilities | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Derivatives liabilities | 0 | 0 | ' | ' |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring [Member] | Restricted Cash [Member] | Short-term Investments [Member] | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Investments | 32 | 17 | ' | ' |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Short-term Investments [Member] | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Investments | 0 | 0 | ' | ' |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Long-Term Investment [Member] | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Investments | 0 | 0 | ' | ' |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring [Member] | Foreign Government Debt Securities [Member] | Short-term Investments [Member] | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Investments | 0 | 0 | ' | ' |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring [Member] | Foreign Government Debt Securities [Member] | Long-Term Investment [Member] | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Investments | 0 | 0 | ' | ' |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring [Member] | Time Deposits and Other [Member] | Short-term Investments [Member] | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Investments | 0 | ' | ' | ' |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring [Member] | Bank Time Deposits [Member] | Short-term Investments [Member] | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Investments | ' | 0 | ' | ' |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Short-term Investments [Member] | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Investments | 776 | 893 | ' | ' |
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring [Member] | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Cash and cash equivalents | 308 | 335 | ' | ' |
Financial assets | 12,528 | 12,259 | ' | ' |
Fair Value Disclosure, additional details | ' | ' | ' | ' |
Funds receivable and customer accounts | 3,603 | 3,563 | ' | ' |
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring [Member] | Short-term Investments [Member] | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Investments | 2,727 | 3,621 | ' | ' |
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring [Member] | Long-Term Investment [Member] | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Investments | 5,853 | 4,696 | ' | ' |
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring [Member] | Other Current Assets | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Derivative assets | ' | 44 | ' | ' |
Derivative Asset Reported in Other Current Assets | 37 | ' | ' | ' |
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring [Member] | Other Current Liabilities | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Derivatives liabilities | ' | 151 | ' | ' |
Fair Value Disclosure, additional details | ' | ' | ' | ' |
Derivative Liabilities Reported in Other Current Liabilities | 114 | ' | ' | ' |
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring [Member] | Restricted Cash [Member] | Short-term Investments [Member] | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Investments | 0 | 0 | ' | ' |
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Short-term Investments [Member] | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Investments | 2,673 | 3,529 | ' | ' |
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Long-Term Investment [Member] | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Investments | 5,615 | 4,445 | ' | ' |
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring [Member] | Foreign Government Debt Securities [Member] | Short-term Investments [Member] | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Investments | 4 | 43 | ' | ' |
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring [Member] | Foreign Government Debt Securities [Member] | Long-Term Investment [Member] | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Investments | 238 | 251 | ' | ' |
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring [Member] | Time Deposits and Other [Member] | Short-term Investments [Member] | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Investments | 50 | ' | ' | ' |
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring [Member] | Bank Time Deposits [Member] | Short-term Investments [Member] | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Investments | ' | 49 | ' | ' |
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Short-term Investments [Member] | ' | ' | ' | ' |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] | ' | ' | ' | ' |
Investments | 0 | 0 | ' | ' |
Bank Time Deposits [Member] | ' | ' | ' | ' |
Fair Value Disclosure, additional details | ' | ' | ' | ' |
Held-to-maturity Securities, Current | ' | $6 | ' | ' |