Leases (Schedule of Maturities of Operating and Financing Leases) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Lessee, operating lease, liability, payments, due next twelve months	$ 139
Finance lease, liability, payments, due next twelve months	13
Lease liability, payments, due next twelve months	152
Lessee, operating lease, liability, payments, due year two	97
Finance lease, liability, payments, due year two	12
Lease liability, payments, due year two	109
Lessee, operating lease, liability, payments, due year three	60
Finance lease, liability, payments, due year three	10
Lease liability, payments due, year three	70
Lessee, operating lease, liability, payments, due year four	38
Finance lease, liability, payments, due year four	9
Lease liability, payments, due year four	47
Lessee, operating lease, liability, payments, due year five	23
Finance lease, liability, payments, due year five	8
Lease liability, payments, due year five	31
Lessee, operating lease, liability, payments, due after year five	28
Finance lease, liability, payments, due after year five	34
Lease liability payments, due after year five	62
Operating lease, liability, payment, due	385
Finance lease, liability, payment, due	86
Lease liability, payments, total	471
Lessee, operating lease, liability, undiscounted excess amount	17
Lessee, finance lease, liability, undiscounted excess amount	20
Lease liability, undiscounted excess amount	37
Operating lease liability	368
Finance lease liability	66	$ 71
Lease liability total	$ 434	$ 461