Leases (Schedule of Maturities of Operating and Financing Leases) (Details) - USD ($)
$ in Millions |
Dec. 31, 2019 |
Dec. 31, 2018 |
| Leases [Abstract] |
|
|
| Lessee, operating lease, liability, payments, due next twelve months |
$ 147
|
|
| Finance lease, liability, payments, due next twelve months |
16
|
|
| Lease liability, payments, due next twelve months |
163
|
|
| Lessee, operating lease, liability, payments, due year two |
110
|
|
| Finance lease, liability, payments, due year two |
15
|
|
| Lease liability, payments, due year two |
125
|
|
| Lessee, operating lease, liability, payments, due year three |
75
|
|
| Finance lease, liability, payments, due year three |
14
|
|
| Lease liability, payments due, year three |
89
|
|
| Lessee, operating lease, liability, payments, due year four |
42
|
|
| Finance lease, liability, payments, due year four |
13
|
|
| Lease liability, payments, due year four |
55
|
|
| Lessee, operating lease, liability, payments, due year five |
24
|
|
| Finance lease, liability, payments, due year five |
10
|
|
| Lease liability, payments, due year five |
34
|
|
| Lessee, operating lease, liability, payments, due after year five |
103
|
|
| Finance lease, liability, payments, due after year five |
66
|
|
| Lease liability payments, due after year five |
169
|
|
| Operating lease, liability, payment, due |
501
|
|
| Finance lease, liability, payment, due |
134
|
|
| Lease liability, payments, total |
635
|
|
| Lessee, operating lease, liability, undiscounted excess amount |
63
|
|
| Lessee, finance lease, liability, undiscounted excess amount |
34
|
|
| Lease liability, undiscounted excess amount |
97
|
|
| Operating lease liability |
438
|
|
| Finance lease liability |
100
|
$ 63
|
| Lease liability total |
$ 538
|
|