Cash Payments For Interest (Net of Amounts Capitalized) (Details) - USD ($) $ in Millions |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
Debt Disclosure [Abstract] | |||
Cash payments for interest (net of amounts capitalized) | $ 1,152 | $ 1,023 | $ 681 |