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Basis of Presentation and Significant Accounting Policies (Details) - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Assets |  |
Deferred charges and other assets, net | $ 2,653 | $ 2,626
Liabilities |  |
Debt and capital lease obligations, less current portion | 7,207 | 7,208
Deferred income taxes | $ 7,192 | 7,060
Adjustments for New Accounting Pronouncements [Member] |  |
Assets |  |
Current deferred income taxes |  | 0
Deferred charges and other assets, net |  | 2,626
Liabilities |  |
Current deferred income taxes |  | 0
Debt and capital lease obligations, less current portion |  | 7,208
Deferred income taxes |  | 7,060
Adjustments for New Accounting Pronouncements [Member] | Previously Reported [Member] |  |
Assets |  |
Current deferred income taxes |  | 74
Deferred charges and other assets, net |  | 2,668
Liabilities |  |
Current deferred income taxes |  | 366
Debt and capital lease obligations, less current portion |  | 7,250
Deferred income taxes |  | 6,768
Adjustments for New Accounting Pronouncements [Member] | Reclassifications [Member] |  |
Assets |  |
Current deferred income taxes |  | (74)
Deferred charges and other assets, net |  | (42)
Liabilities |  |
Current deferred income taxes |  | (366)
Debt and capital lease obligations, less current portion |  | (42)
Deferred income taxes |  | $ 292

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