Leases Supplemental Balance Sheet Information (Details) $ in Millions	Dec. 31, 2019 USD ($)
Leases [Abstract]
Operating lease right-of-use asset	$ 404
Current portion of operating lease liabilities	102
Long-term operating lease liabilities	324
Total operating lease liabilities	426
Finance lease right-of-use assets	14
Current portion of finance lease liabilities	4
Long-term finance lease liabilities	11
Total finance lease liabilities	$ 15