Employee Benefit Plans (Schedule of Allocation of Plan Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2020		Dec. 31, 2019
Defined Benefit Plan Change In Benefit Obligation [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 157		$ 133
Mutual Funds [Member]
Defined Benefit Plan Change In Benefit Obligation [Line Items]
Defined Benefit Plan, Plan Assets, Amount	157	[1]	$ 133	[2]
U.S. Equity Funds [Member]
Defined Benefit Plan Change In Benefit Obligation [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage			27.00%
U.S. Fixed Income Funds [Member]
Defined Benefit Plan Change In Benefit Obligation [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage			39.00%
Non-U.S. Equity Funds [Member]
Defined Benefit Plan Change In Benefit Obligation [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage			18.00%
Other [Member]
Defined Benefit Plan Change In Benefit Obligation [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage			16.00%
Cash and Cash Equivalents [Member]
Defined Benefit Plan Change In Benefit Obligation [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0		$ 0
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Change In Benefit Obligation [Line Items]
Defined Benefit Plan, Plan Assets, Amount	157		133
Fair Value, Inputs, Level 1 [Member] | Mutual Funds [Member]
Defined Benefit Plan Change In Benefit Obligation [Line Items]
Defined Benefit Plan, Plan Assets, Amount	157	[1]	133	[2]
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Change In Benefit Obligation [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0		0
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Change In Benefit Obligation [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0		0
Fair Value, Inputs, Level 2 [Member] | Mutual Funds [Member]
Defined Benefit Plan Change In Benefit Obligation [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	[1]	0	[2]
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Change In Benefit Obligation [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0		0
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Change In Benefit Obligation [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0		0
Fair Value, Inputs, Level 3 [Member] | Mutual Funds [Member]
Defined Benefit Plan Change In Benefit Obligation [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	[1]	0	[2]
Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Change In Benefit Obligation [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 0		$ 0

[1] Mutual funds were invested 27% in U.S. equity funds, 39% in U.S. fixed income funds, 18% in non-U.S. equity funds and 16% in other.

[2] Mutual funds were invested 27% in U.S. equity funds, 39% in U.S. fixed income funds, 18% in non-U.S. equity funds and 16% in other.