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Provision for Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2017
Income Tax Information |  |
Tax benefit related to reduction in company's unrecognized tax benefits |  | $ 57
Pre-tax benefit on associated accrued interest reversals |  | 50
Continuing Operations [Member] |  |
Income Tax Information |  |
Tax benefit related to reduction in company's unrecognized tax benefits |  | 53
Pre-tax benefit on associated accrued interest reversals |  | 47
Discontinued Operations [Member] |  |
Income Tax Information |  |
Tax benefit related to reduction in company's unrecognized tax benefits |  | 4
Pre-tax benefit on associated accrued interest reversals |  | $ 3
2016 RTA [Member] |  |
Income Tax Information |  |
Other Tax Expense (Benefit) | $ 29 |

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- Definition Pre-tax benefit on associated accrued interest reversals related to a reduction in the company's unrecognized tax benefits due to the closure of various tax statutes of limitations + References No definition available. + Details
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- Definition Tax benefit related to reduction in company's unrecognized tax benefits due to closure of various tax statutes of limitations + References No definition available. + Details
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