Leases and Commitments Operating Lease Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating Lease, Right-of-Use Asset	$ 540	$ 396
Other Liabilities [Member]
Leases [Abstract]
Operating lease	133	130
Operating Lease, Liability, Noncurrent	423
Operating Lease, Liability	556	404
Operating Lease, Liability	556	404
Operating lease	133	130
Operating Lease, Liability, Noncurrent	423
Short-term Debt [Member]
Leases [Abstract]
Operating lease	133	130
Operating lease	$ 133	130
Long-term Debt [Member]
Leases [Abstract]
Operating Lease, Liability, Noncurrent		274
Operating Lease, Liability, Noncurrent		$ 274