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Fair Value Measurements (Details)
 3 Months Ended
Jun. 30, 2011
USD ($)
Mar. 31, 2011
JPY (¥)
Dec. 31, 2010
JPY (¥)
Sep. 30, 2010
USD ($)
Sep. 30, 2010
JPY (¥)
Jun. 30, 2010
USD ($)
Mar. 31, 2010
JPY (¥)
Mar. 31, 2010
Jun. 30, 2011
Other Current Assets [Member]
Foreign Currency Exchange Derivatives [Member]
USD ($)
Sep. 30, 2010
Other Current Assets [Member]
Foreign Currency Exchange Derivatives [Member]
USD ($)
Jun. 30, 2010
Other Current Assets [Member]
Foreign Currency Exchange Derivatives [Member]
USD ($)
Jun. 30, 2011
Other Current Assets [Member]
Foreign Currency Exchange Derivatives [Member]
Quoted Prices in Active Markets (Level 1) [Member]
USD ($)
Sep. 30, 2010
Other Current Assets [Member]
Foreign Currency Exchange Derivatives [Member]
Quoted Prices in Active Markets (Level 1) [Member]
USD ($)
Jun. 30, 2010
Other Current Assets [Member]
Foreign Currency Exchange Derivatives [Member]
Quoted Prices in Active Markets (Level 1) [Member]
USD ($)
Jun. 30, 2011
Other Current Assets [Member]
Foreign Currency Exchange Derivatives [Member]
Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Sep. 30, 2010
Other Current Assets [Member]
Foreign Currency Exchange Derivatives [Member]
Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Jun. 30, 2010
Other Current Assets [Member]
Foreign Currency Exchange Derivatives [Member]
Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Jun. 30, 2011
Other Current Assets [Member]
Foreign Currency Exchange Derivatives [Member]
Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Sep. 30, 2010
Other Current Assets [Member]
Foreign Currency Exchange Derivatives [Member]
Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Jun. 30, 2010
Other Current Assets [Member]
Foreign Currency Exchange Derivatives [Member]
Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Jun. 30, 2011
Other Noncurrent Assets [Member]
Foreign Currency Exchange Derivatives [Member]
USD ($)
Sep. 30, 2010
Other Noncurrent Assets [Member]
Foreign Currency Exchange Derivatives [Member]
USD ($)
Jun. 30, 2010
Other Noncurrent Assets [Member]
Foreign Currency Exchange Derivatives [Member]
USD ($)
Jun. 30, 2011
Other Noncurrent Assets [Member]
Foreign Currency Exchange Derivatives [Member]
Quoted Prices in Active Markets (Level 1) [Member]
USD ($)
Sep. 30, 2010
Other Noncurrent Assets [Member]
Foreign Currency Exchange Derivatives [Member]
Quoted Prices in Active Markets (Level 1) [Member]
USD ($)
Jun. 30, 2010
Other Noncurrent Assets [Member]
Foreign Currency Exchange Derivatives [Member]
Quoted Prices in Active Markets (Level 1) [Member]
USD ($)
Jun. 30, 2011
Other Noncurrent Assets [Member]
Foreign Currency Exchange Derivatives [Member]
Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Sep. 30, 2010
Other Noncurrent Assets [Member]
Foreign Currency Exchange Derivatives [Member]
Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Jun. 30, 2010
Other Noncurrent Assets [Member]
Foreign Currency Exchange Derivatives [Member]
Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Jun. 30, 2011
Other Noncurrent Assets [Member]
Foreign Currency Exchange Derivatives [Member]
Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Sep. 30, 2010
Other Noncurrent Assets [Member]
Foreign Currency Exchange Derivatives [Member]
Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Jun. 30, 2010
Other Noncurrent Assets [Member]
Foreign Currency Exchange Derivatives [Member]
Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Jun. 30, 2011
Other Current Liabilities [Member]
Foreign Currency Exchange Derivatives [Member]
USD ($)
Sep. 30, 2010
Other Current Liabilities [Member]
Foreign Currency Exchange Derivatives [Member]
USD ($)
Jun. 30, 2010
Other Current Liabilities [Member]
Foreign Currency Exchange Derivatives [Member]
USD ($)
Jun. 30, 2011
Other Current Liabilities [Member]
Foreign Currency Exchange Derivatives [Member]
Quoted Prices in Active Markets (Level 1) [Member]
USD ($)
Sep. 30, 2010
Other Current Liabilities [Member]
Foreign Currency Exchange Derivatives [Member]
Quoted Prices in Active Markets (Level 1) [Member]
USD ($)
Jun. 30, 2010
Other Current Liabilities [Member]
Foreign Currency Exchange Derivatives [Member]
Quoted Prices in Active Markets (Level 1) [Member]
USD ($)
Jun. 30, 2011
Other Current Liabilities [Member]
Foreign Currency Exchange Derivatives [Member]
Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Sep. 30, 2010
Other Current Liabilities [Member]
Foreign Currency Exchange Derivatives [Member]
Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Jun. 30, 2010
Other Current Liabilities [Member]
Foreign Currency Exchange Derivatives [Member]
Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Jun. 30, 2011
Other Current Liabilities [Member]
Foreign Currency Exchange Derivatives [Member]
Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Sep. 30, 2010
Other Current Liabilities [Member]
Foreign Currency Exchange Derivatives [Member]
Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Jun. 30, 2010
Other Current Liabilities [Member]
Foreign Currency Exchange Derivatives [Member]
Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Jun. 30, 2011
Other Noncurrent Liabilities [Member]
Foreign Currency Exchange Derivatives [Member]
USD ($)
Sep. 30, 2010
Other Noncurrent Liabilities [Member]
Foreign Currency Exchange Derivatives [Member]
USD ($)
Jun. 30, 2010
Other Noncurrent Liabilities [Member]
Foreign Currency Exchange Derivatives [Member]
USD ($)
Jun. 30, 2011
Other Noncurrent Liabilities [Member]
Foreign Currency Exchange Derivatives [Member]
Quoted Prices in Active Markets (Level 1) [Member]
USD ($)
Sep. 30, 2010
Other Noncurrent Liabilities [Member]
Foreign Currency Exchange Derivatives [Member]
Quoted Prices in Active Markets (Level 1) [Member]
USD ($)
Jun. 30, 2010
Other Noncurrent Liabilities [Member]
Foreign Currency Exchange Derivatives [Member]
Quoted Prices in Active Markets (Level 1) [Member]
USD ($)
Jun. 30, 2011
Other Noncurrent Liabilities [Member]
Foreign Currency Exchange Derivatives [Member]
Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Sep. 30, 2010
Other Noncurrent Liabilities [Member]
Foreign Currency Exchange Derivatives [Member]
Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Jun. 30, 2010
Other Noncurrent Liabilities [Member]
Foreign Currency Exchange Derivatives [Member]
Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Jun. 30, 2011
Other Noncurrent Liabilities [Member]
Foreign Currency Exchange Derivatives [Member]
Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Sep. 30, 2010
Other Noncurrent Liabilities [Member]
Foreign Currency Exchange Derivatives [Member]
Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Jun. 30, 2010
Other Noncurrent Liabilities [Member]
Foreign Currency Exchange Derivatives [Member]
Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Jun. 30, 2011
Other Current Assets [Member]
Commodity Derivatives [Member]
USD ($)
Sep. 30, 2010
Other Current Assets [Member]
Commodity Derivatives [Member]
USD ($)
Jun. 30, 2010
Other Current Assets [Member]
Commodity Derivatives [Member]
USD ($)
Jun. 30, 2011
Other Current Assets [Member]
Commodity Derivatives [Member]
Quoted Prices in Active Markets (Level 1) [Member]
USD ($)
Sep. 30, 2010
Other Current Assets [Member]
Commodity Derivatives [Member]
Quoted Prices in Active Markets (Level 1) [Member]
USD ($)
Jun. 30, 2010
Other Current Assets [Member]
Commodity Derivatives [Member]
Quoted Prices in Active Markets (Level 1) [Member]
USD ($)
Jun. 30, 2011
Other Current Assets [Member]
Commodity Derivatives [Member]
Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Sep. 30, 2010
Other Current Assets [Member]
Commodity Derivatives [Member]
Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Jun. 30, 2010
Other Current Assets [Member]
Commodity Derivatives [Member]
Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Jun. 30, 2011
Other Current Assets [Member]
Commodity Derivatives [Member]
Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Sep. 30, 2010
Other Current Assets [Member]
Commodity Derivatives [Member]
Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Jun. 30, 2010
Other Current Assets [Member]
Commodity Derivatives [Member]
Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Jun. 30, 2011
Other Current Liabilities [Member]
Commodity Derivatives [Member]
USD ($)
Jun. 30, 2010
Other Current Liabilities [Member]
Commodity Derivatives [Member]
USD ($)
Jun. 30, 2011
Other Current Liabilities [Member]
Commodity Derivatives [Member]
Quoted Prices in Active Markets (Level 1) [Member]
USD ($)
Jun. 30, 2010
Other Current Liabilities [Member]
Commodity Derivatives [Member]
Quoted Prices in Active Markets (Level 1) [Member]
USD ($)
Jun. 30, 2011
Other Current Liabilities [Member]
Commodity Derivatives [Member]
Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Jun. 30, 2010
Other Current Liabilities [Member]
Commodity Derivatives [Member]
Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Jun. 30, 2011
Other Current Liabilities [Member]
Commodity Derivatives [Member]
Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Jun. 30, 2010
Other Current Liabilities [Member]
Commodity Derivatives [Member]
Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Jun. 30, 2011
Other Noncurrent Assets [Member]
Interest Rate Swaps [Member]
USD ($)
Jun. 30, 2010
Other Noncurrent Assets [Member]
Interest Rate Swaps [Member]
USD ($)
Jun. 30, 2011
Other Noncurrent Assets [Member]
Interest Rate Swaps [Member]
Quoted Prices in Active Markets (Level 1) [Member]
USD ($)
Jun. 30, 2010
Other Noncurrent Assets [Member]
Interest Rate Swaps [Member]
Quoted Prices in Active Markets (Level 1) [Member]
USD ($)
Jun. 30, 2011
Other Noncurrent Assets [Member]
Interest Rate Swaps [Member]
Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Jun. 30, 2010
Other Noncurrent Assets [Member]
Interest Rate Swaps [Member]
Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Jun. 30, 2011
Other Noncurrent Assets [Member]
Interest Rate Swaps [Member]
Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Jun. 30, 2010
Other Noncurrent Assets [Member]
Interest Rate Swaps [Member]
Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Jun. 30, 2011
Other Noncurrent Assets [Member]
Equity Swap [Member]
USD ($)
Sep. 30, 2010
Other Noncurrent Assets [Member]
Equity Swap [Member]
USD ($)
Jun. 30, 2010
Other Noncurrent Assets [Member]
Equity Swap [Member]
USD ($)
Jun. 30, 2011
Other Noncurrent Assets [Member]
Equity Swap [Member]
Quoted Prices in Active Markets (Level 1) [Member]
USD ($)
Sep. 30, 2010
Other Noncurrent Assets [Member]
Equity Swap [Member]
Quoted Prices in Active Markets (Level 1) [Member]
USD ($)
Jun. 30, 2010
Other Noncurrent Assets [Member]
Equity Swap [Member]
Quoted Prices in Active Markets (Level 1) [Member]
USD ($)
Jun. 30, 2011
Other Noncurrent Assets [Member]
Equity Swap [Member]
Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Sep. 30, 2010
Other Noncurrent Assets [Member]
Equity Swap [Member]
Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Jun. 30, 2010
Other Noncurrent Assets [Member]
Equity Swap [Member]
Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Jun. 30, 2011
Other Noncurrent Assets [Member]
Equity Swap [Member]
Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Sep. 30, 2010
Other Noncurrent Assets [Member]
Equity Swap [Member]
Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Jun. 30, 2010
Other Noncurrent Assets [Member]
Equity Swap [Member]
Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Jun. 30, 2010
Current Portion of Long-Term Debt [Member]
Fixed Rate Debt Swapped To Floating [Member]
USD ($)
Jun. 30, 2010
Current Portion of Long-Term Debt [Member]
Fixed Rate Debt Swapped To Floating [Member]
Quoted Prices in Active Markets (Level 1) [Member]
USD ($)
Jun. 30, 2010
Current Portion of Long-Term Debt [Member]
Fixed Rate Debt Swapped To Floating [Member]
Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Jun. 30, 2010
Current Portion of Long-Term Debt [Member]
Fixed Rate Debt Swapped To Floating [Member]
Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Jun. 30, 2011
Long-Term Debt [Member]
Fixed Rate Debt Swapped To Floating [Member]
USD ($)
Jun. 30, 2010
Long-Term Debt [Member]
Fixed Rate Debt Swapped To Floating [Member]
USD ($)
Jun. 30, 2011
Long-Term Debt [Member]
Fixed Rate Debt Swapped To Floating [Member]
Quoted Prices in Active Markets (Level 1) [Member]
USD ($)
Jun. 30, 2010
Long-Term Debt [Member]
Fixed Rate Debt Swapped To Floating [Member]
Quoted Prices in Active Markets (Level 1) [Member]
USD ($)
Jun. 30, 2011
Long-Term Debt [Member]
Fixed Rate Debt Swapped To Floating [Member]
Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Jun. 30, 2010
Long-Term Debt [Member]
Fixed Rate Debt Swapped To Floating [Member]
Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Jun. 30, 2011
Long-Term Debt [Member]
Fixed Rate Debt Swapped To Floating [Member]
Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Jun. 30, 2010
Long-Term Debt [Member]
Fixed Rate Debt Swapped To Floating [Member]
Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Jun. 30, 2011
Other Current Liabilities [Member]
Cross-Currency Interest Rate Swaps [Member]
USD ($)
Sep. 30, 2010
Other Current Liabilities [Member]
Cross-Currency Interest Rate Swaps [Member]
USD ($)
Jun. 30, 2010
Other Current Liabilities [Member]
Cross-Currency Interest Rate Swaps [Member]
USD ($)
Jun. 30, 2011
Other Current Liabilities [Member]
Cross-Currency Interest Rate Swaps [Member]
Quoted Prices in Active Markets (Level 1) [Member]
USD ($)
Sep. 30, 2010
Other Current Liabilities [Member]
Cross-Currency Interest Rate Swaps [Member]
Quoted Prices in Active Markets (Level 1) [Member]
USD ($)
Jun. 30, 2010
Other Current Liabilities [Member]
Cross-Currency Interest Rate Swaps [Member]
Quoted Prices in Active Markets (Level 1) [Member]
USD ($)
Jun. 30, 2011
Other Current Liabilities [Member]
Cross-Currency Interest Rate Swaps [Member]
Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Sep. 30, 2010
Other Current Liabilities [Member]
Cross-Currency Interest Rate Swaps [Member]
Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Jun. 30, 2010
Other Current Liabilities [Member]
Cross-Currency Interest Rate Swaps [Member]
Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Jun. 30, 2011
Other Current Liabilities [Member]
Cross-Currency Interest Rate Swaps [Member]
Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Sep. 30, 2010
Other Current Liabilities [Member]
Cross-Currency Interest Rate Swaps [Member]
Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Jun. 30, 2010
Other Current Liabilities [Member]
Cross-Currency Interest Rate Swaps [Member]
Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Jun. 30, 2011
Other Noncurrent Assets [Member]
Quoted Prices in Active Markets (Level 1) [Member]
Investments in Marketable Common Stock [Member]
USD ($)
Sep. 30, 2010
Other Noncurrent Assets [Member]
Quoted Prices in Active Markets (Level 1) [Member]
Investments in Marketable Common Stock [Member]
USD ($)
Jun. 30, 2010
Other Noncurrent Assets [Member]
Quoted Prices in Active Markets (Level 1) [Member]
Investments in Marketable Common Stock [Member]
USD ($)
Jun. 30, 2011
Quoted Prices in Active Markets (Level 1) [Member]
USD ($)
Sep. 30, 2010
Quoted Prices in Active Markets (Level 1) [Member]
USD ($)
Jun. 30, 2010
Quoted Prices in Active Markets (Level 1) [Member]
USD ($)
Jun. 30, 2011
Other Noncurrent Assets [Member]
Significant Other Observable Inputs (Level 2) [Member]
Investments in Marketable Common Stock [Member]
USD ($)
Sep. 30, 2010
Other Noncurrent Assets [Member]
Significant Other Observable Inputs (Level 2) [Member]
Investments in Marketable Common Stock [Member]
USD ($)
Jun. 30, 2010
Other Noncurrent Assets [Member]
Significant Other Observable Inputs (Level 2) [Member]
Investments in Marketable Common Stock [Member]
USD ($)
Jun. 30, 2011
Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Sep. 30, 2010
Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Jun. 30, 2010
Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Jun. 30, 2011
Other Noncurrent Assets [Member]
Significant Unobservable Inputs (Level 3) [Member]
Investments in Marketable Common Stock [Member]
USD ($)
Sep. 30, 2010
Other Noncurrent Assets [Member]
Significant Unobservable Inputs (Level 3) [Member]
Investments in Marketable Common Stock [Member]
USD ($)
Jun. 30, 2010
Other Noncurrent Assets [Member]
Significant Unobservable Inputs (Level 3) [Member]
Investments in Marketable Common Stock [Member]
USD ($)
Jun. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Sep. 30, 2010
Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Jun. 30, 2010
Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Jun. 30, 2011
Other Noncurrent Assets [Member]
Investments in Marketable Common Stock [Member]
USD ($)
Sep. 30, 2010
Other Noncurrent Assets [Member]
Investments in Marketable Common Stock [Member]
USD ($)
Jun. 30, 2010
Other Noncurrent Assets [Member]
Investments in Marketable Common Stock [Member]
USD ($)
Mar. 31, 2011
Series One [Member]
USD ($)
Mar. 31, 2010
Series One [Member]
USD ($)
Mar. 31, 2011
Series Two [Member]
USD ($)
Mar. 31, 2010
Series Two [Member]
USD ($)
Mar. 31, 2011
Series Three [Member]
USD ($)
Assets measured at fair value                                                                                                                                                                                                                                                                                                    
Fair Value Measurements $ 248,000,000     $ 178,000,000   $ 151,000,000     $ 8,000,000 $ 27,000,000 $ 23,000,000 $ 8,000,000 $ 27,000,000 $ 23,000,000 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 2,000,000 $ 2,000,000 $ 2,000,000 $ 2,000,000 $ 2,000,000 $ 2,000,000 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0                                                 $ 8,000,000 $ 14,000,000 $ 2,000,000 $ 0 $ 0 $ 0 $ 8,000,000 $ 14,000,000 $ 2,000,000 $ 0 $ 0 $ 0                 $ 15,000,000 $ 9,000,000 $ 0 $ 0 $ 15,000,000 $ 9,000,000 $ 0 $ 0 $ 177,000,000 $ 104,000,000 $ 91,000,000 $ 177,000,000 $ 104,000,000 $ 91,000,000 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0                                                 $ 38,000,000 $ 31,000,000 $ 24,000,000 $ 225,000,000 $ 164,000,000 $ 140,000,000 $ 0 $ 0 $ 0 $ 23,000,000 $ 14,000,000 $ 11,000,000 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 38,000,000 $ 31,000,000 $ 24,000,000          
Liabilities measured at fair value                                                                                                                                                                                                                                                                                                    
Fair Value Measurements 883,000,000     46,000,000   1,039,000,000                                                     8,000,000 27,000,000 23,000,000 8,000,000 27,000,000 23,000,000 0 0 0 0 0 0 1,000,000 2,000,000 3,000,000 1,000,000 2,000,000 3,000,000 0 0 0 0 0 0                         1,000,000 8,000,000 0 0 1,000,000 8,000,000 0 0                                         594,000,000 0 594,000,000 0 865,000,000 404,000,000 0 0 865,000,000 404,000,000 0 0 8,000,000 17,000,000 7,000,000 0 0 0 8,000,000 17,000,000 7,000,000 0 0 0       9,000,000 29,000,000 26,000,000       874,000,000 17,000,000 1,013,000,000       0 0 0                
Fair Value Measurements (Textuals)                                                                                                                                                                                                                                                                                                    
Fixed to floating interest rate swaps entered                                                                                                                                                                                                                                                                                           100,000,000 100,000,000 300,000,000 300,000,000 450,000,000
Coupon rate of notes                                                                                                                                                                                                                                                                                           5.80% 5.80% 4.875% 4.875% 1.75%
Number of fixed to floating interest rate swaps entered                                                                                                                                                                                                                                                                                               2 2 5
Unrealized gains on investments in marketable common stock 10,000,000     3,000,000                                                                                                                                                                                                                                                                                            
Unrealized losses on investments in marketable common stock           2,000,000                                                                                                                                                                                                                                                                                        
Number of cross-currency interest rate swaps entered               3                                                                                                                                                                                                                                                                                    
Cross-currency interest rate swaps entered             20,000,000,000                                                                                                                                                                                                                                                                                      
Cross-currency interest rate swaps matured   10,000,000,000 5,000,000,000   5,000,000,000                                                                                                                                                                                                                                                                                          
Period cross-currency interest rate swaps were renewed   1 year 1 year 1 year 1 year                                                                                                                                                                                                                                                                                          
Fair value of long-term debt, determined using market quotes $ 4,900,000,000     $ 3,700,000,000   $ 3,600,000,000