Redeemable Noncontrolling Interest - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
|
| Temporary Equity [Abstract] | ||
| Beginning balance | $ 1,000 | $ 1,000 |
| Net income attributable to redeemable noncontrolling interest | 16 | 16 |
| Distributions to noncontrolling interests | (16) | (16) |
| Ending balance | $ 1,000 | $ 1,000 |