Leases Maturity of Lease Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Operating Lease, Year One	$ 132	$ 152
Operating Lease, Year Two	94	114
Operating Lease, Year Three	71	83
Operating Lease, Year Four	60	61
Operating Lease, Year Five	49	51
Operating Lease, Due After Year Five	106	137
Operating Lease, Total Payments	512	598
Operating Lease, Interest	53	69
Total operating lease liabilities	459	529
Finance Lease, Year One	1	1
Finance Lease, Year Two	1	1
Finance Lease, Year Three	1	1
Finance Lease, Year Four	1	1
Finance Lease, Year Five	0	1
Finance Lease, Due After Year Five	0	0
Finance Lease, Total Payments	4	5
Finance Lease, Interest	0	0
Finance Lease, Liability	$ 4	$ 5