Debt and Credit Agreements - Activity Related to Long-Term Debt (Details) - USD ($) $ in Millions |
6 Months Ended | |
---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
|
Movement, Debt Instruments [Roll Forward] | ||
Beginning balance, current portion | $ 19 | |
Beginning balance, long-term portion | 11,790 | |
Beginning balance, total | 11,809 | |
Long-term debt issued | 2,000 | $ 850 |
Discount, premium and other activity | (21) | |
Ending balance, current portion | 19 | |
Ending balance, long-term portion | 13,769 | |
Ending balance, total | 13,788 | |
Current Portion | ||
Movement, Debt Instruments [Roll Forward] | ||
Beginning balance, current portion | 19 | |
Long-term debt issued | 0 | |
Discount, premium and other activity | ||
Ending balance, current portion | 19 | |
Long-term Portion | ||
Movement, Debt Instruments [Roll Forward] | ||
Beginning balance, long-term portion | 11,790 | |
Long-term debt issued | 2,000 | |
Discount, premium and other activity | (21) | |
Ending balance, long-term portion | $ 13,769 |