Fair Value Measurement of Assets and Liabilities (Details) (USD $) | Mar. 31, 2014 | Dec. 31, 2013 |
In Millions, unless otherwise specified |
Fair Value Disclosure, additional details | ' | ' |
Funds receivable and customer accounts | $9,648 | $9,260 |
Long-Term Investment [Member] | ' | ' |
Fair Value Disclosure, additional details | ' | ' |
Cost and equity method investments included in long-term investments | 357 | 269 |
Foreign Government Debt Securities [Member] | Short-term Investments [Member] | ' | ' |
Fair Value Disclosure, additional details | ' | ' |
Funds receivable and customer accounts | 3,458 | ' |
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 | 4,415 | 4,494 |
Financial assets | 16,171 | 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 | 3,429 | 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 | 4,848 | 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 | 21 | 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 | 119 | 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 | 19 | 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 | 2,620 | 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 | 4,611 | 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 | 9 | 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 | 237 | 251 |
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 | 781 | 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 | 4,355 | 4,159 |
Financial assets | 5,155 | 5,069 |
Fair Value Disclosure, additional details | ' | ' |
Funds receivable and customer accounts | 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 | 800 | 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 | 19 | 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] | 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 | 781 | 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 | 60 | 335 |
Financial assets | 11,016 | 12,259 |
Fair Value Disclosure, additional details | ' | ' |
Funds receivable and customer accounts | 3,458 | ' |
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 | 2,629 | 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 | 4,848 | 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 | 21 | 44 |
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 | 119 | 151 |
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 | 2,620 | 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 | 4,611 | 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 | 9 | 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 | 237 | 251 |
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 | $6 |