Employee Benefit Plans (Schedule of Allocation of Plan Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	$ 47,960	$ 63,323
Quoted price in active markets (Level 1) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	8,688	11,394
Significant other observable inputs (Level 2) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	15,003	21,178
Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	1,650	1,885	$ 1,649
Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	21,810	27,666
Global Equities [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	6,199	9,417
Global Equities [Member] | Quoted price in active markets (Level 1) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	6,194	9,411
Global Equities [Member] | Significant other observable inputs (Level 2) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	5	6
Global Equities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	0	0
Global Equities [Member] | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	0	0
Global Equity Commingled Funds [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	588	932
Global Equity Commingled Funds [Member] | Quoted price in active markets (Level 1) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	20	3
Global Equity Commingled Funds [Member] | Significant other observable inputs (Level 2) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	568	929
Global Equity Commingled Funds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	0	0
Global Equity Commingled Funds [Member] | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	0	0
Enhanced Global Equities [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	22	209
Enhanced Global Equities [Member] | Quoted price in active markets (Level 1) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	(53)	46
Enhanced Global Equities [Member] | Significant other observable inputs (Level 2) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	75	163
Enhanced Global Equities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	0	0
Enhanced Global Equities [Member] | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	0	0
Other Public Equities
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	5,771	8,495
Other Public Equities | Quoted price in active markets (Level 1) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	0	0
Other Public Equities | Significant other observable inputs (Level 2) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	0	0
Other Public Equities | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	0	0
Other Public Equities | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	5,771	8,495
Private Equity Funds [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	4,068	4,490
Private Equity Funds [Member] | Quoted price in active markets (Level 1) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	0	0
Private Equity Funds [Member] | Significant other observable inputs (Level 2) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	0	0
Private Equity Funds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	0	0
Private Equity Funds [Member] | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	4,068	4,490
Governments [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	3,952	3,105
Governments [Member] | Quoted price in active markets (Level 1) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	2,526	1,933
Governments [Member] | Significant other observable inputs (Level 2) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	1,426	1,172
Governments [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	0	0
Governments [Member] | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	0	0
Corporate Debt Securities [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	12,639	18,682
Corporate Debt Securities [Member] | Quoted price in active markets (Level 1) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	1	1
Corporate Debt Securities [Member] | Significant other observable inputs (Level 2) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	12,638	18,681
Corporate Debt Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	0	0	2
Corporate Debt Securities [Member] | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	0	0
Structured Products
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	57	25
Structured Products | Quoted price in active markets (Level 1) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	0	0
Structured Products | Significant other observable inputs (Level 2) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	57	25
Structured Products | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	0	0
Structured Products | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	0	0
Fixed Income Securities [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	6,975	7,367
Fixed Income Securities [Member] | Quoted price in active markets (Level 1) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	0	0
Fixed Income Securities [Member] | Significant other observable inputs (Level 2) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	0	0
Fixed Income Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	0	0
Fixed Income Securities [Member] | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	6,975	7,367
Real Estate [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	3,411	3,628
Real Estate [Member] | Quoted price in active markets (Level 1) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	0	0
Real Estate [Member] | Significant other observable inputs (Level 2) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	0	0
Real Estate [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	1,650	1,885	$ 1,647
Real Estate [Member] | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	1,761	1,743
Other Pension Plan Assets [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	3,155	5,442
Other Pension Plan Assets [Member] | Quoted price in active markets (Level 1) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	0	0
Other Pension Plan Assets [Member] | Significant other observable inputs (Level 2) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	84	91
Other Pension Plan Assets [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	0	0
Other Pension Plan Assets [Member] | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	3,071	5,351
Cash & Cash Equivalents [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	314	331
Cash & Cash Equivalents [Member] | Quoted price in active markets (Level 1) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	0	0
Cash & Cash Equivalents [Member] | Significant other observable inputs (Level 2) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	150	111
Cash & Cash Equivalents [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	0	0
Cash & Cash Equivalents [Member] | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	164	220
Pension Plan Assets Leveled [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	47,151	62,123
Other Assets And Liabilities [Member]
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Fair value of plan assets	$ 809	$ 1,200