Fair Value Measurements (Details) (USD $) | 3 Months Ended | |
Mar. 31, 2014 | Dec. 31, 2013 |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Debt Security, Maturity Period for Classification as Cash Equivalent | 'three months or less | ' |
Investment Security, Maturity Period for Classification as Marketable Security | 'greater than three months | ' |
Securities Purchased under Agreements to Resell Gross | $308,000,000 | $227,000,000 |
Fair Value Measurement, Period After Which Fair Value of Collateral is Adjusted | 'greater than 120 days past due | ' |
Fair Value of Derivative Assets | 668,000,000 | 585,000,000 |
Fair Value of Derivative Liabilities | 470,000,000 | 506,000,000 |
Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Cash equivalents - financial instruments | 75,000,000 | 24,000,000 |
Marketable securities | 2,817,000,000 | 1,943,000,000 |
Fair Value of Derivative Assets | 668,000,000 | 585,000,000 |
Total assets at fair value | 3,560,000,000 | 2,552,000,000 |
Fair Value of Derivative Liabilities | 470,000,000 | 506,000,000 |
Total liabilities at fair value | 470,000,000 | 506,000,000 |
Fair Value, Measurements, Recurring [Member] | Cash Equivalents [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Par value assets excluded from fair value by input | 6,200,000,000 | 6,600,000,000 |
Fair Value, Measurements, Recurring [Member] | Cash [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Par value assets excluded from fair value by input | 2,100,000,000 | 2,800,000,000 |
Fair Value, Measurements, Recurring [Member] | U.S. Government [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Marketable securities | 794,000,000 | 418,000,000 |
Fair Value, Measurements, Recurring [Member] | U.S. government-sponsored enterprises [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Marketable securities | 340,000,000 | 25,000,000 |
Fair Value, Measurements, Recurring [Member] | Non-U.S. government agencies [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Marketable securities | 303,000,000 | 128,000,000 |
Fair Value, Measurements, Recurring [Member] | Corporate debt [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Marketable securities | 1,246,000,000 | 1,273,000,000 |
Fair Value, Measurements, Recurring [Member] | Mortgage-backed and other asset-backed [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Marketable securities | 41,000,000 | 43,000,000 |
Fair Value, Measurements, Recurring [Member] | Non-U.S. government [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Cash equivalents - financial instruments | 75,000,000 | 24,000,000 |
Marketable securities | 93,000,000 | 56,000,000 |
Fair Value, Measurements, Recurring [Member] | Interest rate contracts [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Fair Value of Derivative Assets | 663,000,000 | 584,000,000 |
Fair Value of Derivative Liabilities | 284,000,000 | 305,000,000 |
Fair Value, Measurements, Recurring [Member] | Foreign currency exchange contracts [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Fair Value of Derivative Assets | 4,000,000 | 1,000,000 |
Fair Value of Derivative Liabilities | 21,000,000 | 25,000,000 |
Fair Value, Measurements, Recurring [Member] | Cross-currency interest rate swap contracts [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Fair Value of Derivative Assets | 1,000,000 | 0 |
Fair Value of Derivative Liabilities | 165,000,000 | 176,000,000 |
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Cash equivalents - financial instruments | 0 | 0 |
Marketable securities | 794,000,000 | 418,000,000 |
Fair Value of Derivative Assets | 0 | 0 |
Total assets at fair value | 794,000,000 | 418,000,000 |
Fair Value of Derivative Liabilities | 0 | 0 |
Total liabilities at fair value | 0 | 0 |
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | U.S. Government [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Marketable securities | 794,000,000 | 418,000,000 |
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | U.S. government-sponsored enterprises [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Marketable securities | 0 | 0 |
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Non-U.S. government agencies [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Marketable securities | 0 | 0 |
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Corporate debt [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Marketable securities | 0 | 0 |
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Mortgage-backed and other asset-backed [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Marketable securities | 0 | 0 |
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Non-U.S. government [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Cash equivalents - financial instruments | 0 | 0 |
Marketable securities | 0 | 0 |
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Interest rate contracts [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Fair Value of Derivative Assets | 0 | 0 |
Fair Value of Derivative Liabilities | 0 | 0 |
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Foreign currency exchange contracts [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Fair Value of Derivative Assets | 0 | 0 |
Fair Value of Derivative Liabilities | 0 | 0 |
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Cross-currency interest rate swap contracts [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Fair Value of Derivative Assets | 0 | 0 |
Fair Value of Derivative Liabilities | 0 | 0 |
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Cash equivalents - financial instruments | 75,000,000 | 24,000,000 |
Marketable securities | 2,023,000,000 | 1,525,000,000 |
Fair Value of Derivative Assets | 668,000,000 | 585,000,000 |
Total assets at fair value | 2,766,000,000 | 2,134,000,000 |
Fair Value of Derivative Liabilities | 470,000,000 | 506,000,000 |
Total liabilities at fair value | 470,000,000 | 506,000,000 |
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | U.S. Government [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Marketable securities | 0 | 0 |
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | U.S. government-sponsored enterprises [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Marketable securities | 340,000,000 | 25,000,000 |
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Non-U.S. government agencies [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Marketable securities | 303,000,000 | 128,000,000 |
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Corporate debt [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Marketable securities | 1,246,000,000 | 1,273,000,000 |
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Mortgage-backed and other asset-backed [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Marketable securities | 41,000,000 | 43,000,000 |
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Non-U.S. government [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Cash equivalents - financial instruments | 75,000,000 | 24,000,000 |
Marketable securities | 93,000,000 | 56,000,000 |
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Interest rate contracts [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Fair Value of Derivative Assets | 663,000,000 | 584,000,000 |
Fair Value of Derivative Liabilities | 284,000,000 | 305,000,000 |
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Foreign currency exchange contracts [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Fair Value of Derivative Assets | 4,000,000 | 1,000,000 |
Fair Value of Derivative Liabilities | 21,000,000 | 25,000,000 |
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Cross-currency interest rate swap contracts [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ' | ' |
Fair Value of Derivative Assets | 1,000,000 | 0 |
Fair Value of Derivative Liabilities | $165,000,000 | $176,000,000 |