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Accounting Changes and Error Corrections (Stockholders Equity) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity Attributable to Parent $ 7,626.0 $ 7,947.0 $ 7,081.0 $ 8,180.0  
Stockholders' Equity Attributable to Noncontrolling Interest 90.0 90.0 90.0 0.0  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 7,716.0 8,037.0 7,171.0 8,180.0  
Net income 252.0 197.0 517.0 1,170.0  
Other Comprehensive Income (Loss), Net of Tax 410.0 (358.0) (1,371.0) 409.0  
Dividends, Common Stock, Cash (53.0) (49.0) (205.0) (194.0)  
Treasury Stock, Value, Acquired, Cost Method (67.0) (27.0) (81.0) (99.0)  
Stock Issued During Period, Value, Treasury Stock Reissued (3.0) (4.0) (41.0) (55.0)  
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders (1.0)   (4.0)    
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 253.0 197.0 521.0    
Net Income (Loss) Attributable to Noncontrolling Interest 1.0 0.0 4.0    
Accounting Standards Update 2018-12          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity Attributable to Parent     7,081.0 8,180.0 $ 6,839.0
Stockholders' Equity Attributable to Noncontrolling Interest     90.0 0.0 0.0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest     7,171.0 8,180.0 6,839.0
Net income     517.0 1,170.0  
Other Comprehensive Income (Loss), Net of Tax     (1,371.0) 409.0  
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest     521.0 1,170.0  
Net Income (Loss) Attributable to Noncontrolling Interest     4.0 0.0  
Accounting Standards Update 2018-12 | Previously Reported          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity Attributable to Parent     4,145.0 13,014.0 14,352.0
Stockholders' Equity Attributable to Noncontrolling Interest     90.0 0.0 0.0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest     4,235.0 13,014.0 14,352.0
Net income     623.0 617.0  
Other Comprehensive Income (Loss), Net of Tax     (9,247.0) (1,717.0)  
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest     627.0 617.0  
Net Income (Loss) Attributable to Noncontrolling Interest     4.0 0.0  
Effect of Modified Retrospective Application Accounting Standards Update 2018-12 | Previously Reported          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity Attributable to Parent         (7,491.0)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest         (7,491.0)
Effect of Retrospective Application of Accounting Standards Update 2018-12 | Previously Reported          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity Attributable to Parent         (22.0)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest         (22.0)
Common Stock [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity Attributable to Parent 1.0 1.0 1.0 1.0  
Common Stock [Member] | Accounting Standards Update 2018-12          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity Attributable to Parent     1.0 1.0 1.0
Common Stock [Member] | Accounting Standards Update 2018-12 | Previously Reported          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity Attributable to Parent         1.0
Additional Paid-in Capital [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity Attributable to Parent 2,506.0 2,465.0 2,502.0 2,461.0  
Stock Issued During Period, Value, Treasury Stock Reissued (4.0) (4.0) (41.0) (55.0)  
Additional Paid-in Capital [Member] | Accounting Standards Update 2018-12          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity Attributable to Parent     2,502.0 2,461.0 2,406.0
Additional Paid-in Capital [Member] | Accounting Standards Update 2018-12 | Previously Reported          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity Attributable to Parent         2,406.0
Retained Earnings [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity Attributable to Parent 8,336.0 8,014.0 8,169.0 7,871.0  
Dividends, Common Stock, Cash (53.0) (49.0) (205.0) (194.0)  
Stock Issued During Period, Value, Treasury Stock Reissued (32.0) (5.0) (14.0) (8.0)  
Retained Earnings [Member] | Accounting Standards Update 2018-12          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity Attributable to Parent     8,169.0 7,871.0 6,903.0
Retained Earnings [Member] | Accounting Standards Update 2018-12 | Previously Reported          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity Attributable to Parent         8,148.0
Retained Earnings [Member] | Effect of Modified Retrospective Application Accounting Standards Update 2018-12 | Previously Reported          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity Attributable to Parent         (1,187.0)
Retained Earnings [Member] | Effect of Retrospective Application of Accounting Standards Update 2018-12 | Previously Reported          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity Attributable to Parent         (58.0)
Treasury Stock, Common          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity Attributable to Parent (1,756.0) (1,675.0) (1,720.0) (1,653.0)  
Treasury Stock, Value, Acquired, Cost Method 67.0 27.0 81.0 99.0  
Stock Issued During Period, Value, Treasury Stock Reissued (31.0) (5.0) (14.0) (8.0)  
Treasury Stock, Common | Accounting Standards Update 2018-12          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity Attributable to Parent     (1,720.0) (1,653.0) (1,562.0)
Treasury Stock, Common | Accounting Standards Update 2018-12 | Previously Reported          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity Attributable to Parent         (1,562.0)
AOCI Attributable to Parent [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity Attributable to Parent (1,461.0) (858.0) (1,871.0) (500.0)  
Other Comprehensive Income (Loss), Net of Tax $ 410.0 $ (358.0) (1,371.0) 409.0  
AOCI Attributable to Parent [Member] | Accounting Standards Update 2018-12          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity Attributable to Parent     $ (1,871.0) $ (500.0) (909.0)
AOCI Attributable to Parent [Member] | Accounting Standards Update 2018-12 | Previously Reported          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity Attributable to Parent         5,359.0
AOCI Attributable to Parent [Member] | Effect of Modified Retrospective Application Accounting Standards Update 2018-12 | Previously Reported          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity Attributable to Parent         (6,304.0)
AOCI Attributable to Parent [Member] | Effect of Retrospective Application of Accounting Standards Update 2018-12 | Previously Reported          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity Attributable to Parent         $ 36.0