Leases and Commitments Maturity of Operating Lease Liabilities (Details) $ in Millions	Dec. 31, 2019 USD ($)
Leases [Abstract]
Lessee, Operating Lease, Liability, Payments, Due Year One	$ 145
Lessee, Operating Lease, Liability, Payments, Due Year Two	102
Operating Leases, Future Minimum Payments, Due in Three Years	72
Operating Leases, Future Minimum Payments, Due in Four Years	51
Operating Leases, Future Minimum Payments, Due in Five Years	32
Operating Leases, Future Minimum Payments, Due Thereafter	52
Lessee, Operating Lease, Liability, Payments, Due	454
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	50
Operating Lease, Liability	$ 404